- 07 Jan, 2014 9 commits
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Benjamin Poirier authored
There are many cases where this feature does not improve performance or even reduces it. For example, here are the results from tests that I've run using 3.12.6 on one Intel Xeon W3565 and one i7 920 connected by ixgbe adapters. The results are from the Xeon, but they're similar on the i7. All numbers report the mean±stddev over 10 runs of 10s. 1) latency tests similar to what is described in "c6e1a0d1 net: Allow no-cache copy from user on transmit" There is no statistically significant difference between tx-nocache-copy on/off. nic irqs spread out (one queue per cpu) 200x netperf -r 1400,1 tx-nocache-copy off 692000±1000 tps 50/90/95/99% latency (us): 275±2/643.8±0.4/799±1/2474.4±0.3 tx-nocache-copy on 693000±1000 tps 50/90/95/99% latency (us): 274±1/644.1±0.7/800±2/2474.5±0.7 200x netperf -r 14000,14000 tx-nocache-copy off 86450±80 tps 50/90/95/99% latency (us): 334.37±0.02/838±1/2100±20/3990±40 tx-nocache-copy on 86110±60 tps 50/90/95/99% latency (us): 334.28±0.01/837±2/2110±20/3990±20 2) single stream throughput tests tx-nocache-copy leads to higher service demand throughput cpu0 cpu1 demand (Gb/s) (Gcycle) (Gcycle) (cycle/B) nic irqs and netperf on cpu0 (1x netperf -T0,0 -t omni -- -d send) tx-nocache-copy off 9402±5 9.4±0.2 0.80±0.01 tx-nocache-copy on 9403±3 9.85±0.04 0.838±0.004 nic irqs on cpu0, netperf on cpu1 (1x netperf -T1,1 -t omni -- -d send) tx-nocache-copy off 9401±5 5.83±0.03 5.0±0.1 0.923±0.007 tx-nocache-copy on 9404±2 5.74±0.03 5.523±0.009 0.958±0.002 As a second example, here are some results from Eric Dumazet with latest net-next. tx-nocache-copy also leads to higher service demand (cpu is Intel(R) Xeon(R) CPU X5660 @ 2.80GHz) lpq83:~# ./ethtool -K eth0 tx-nocache-copy on lpq83:~# perf stat ./netperf -H lpq84 -c MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to lpq84.prod.google.com () port 0 AF_INET Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % S % U us/KB us/KB 87380 16384 16384 10.00 9407.44 2.50 -1.00 0.522 -1.000 Performance counter stats for './netperf -H lpq84 -c': 4282.648396 task-clock # 0.423 CPUs utilized 9,348 context-switches # 0.002 M/sec 88 CPU-migrations # 0.021 K/sec 355 page-faults # 0.083 K/sec 11,812,797,651 cycles # 2.758 GHz [82.79%] 9,020,522,817 stalled-cycles-frontend # 76.36% frontend cycles idle [82.54%] 4,579,889,681 stalled-cycles-backend # 38.77% backend cycles idle [67.33%] 6,053,172,792 instructions # 0.51 insns per cycle # 1.49 stalled cycles per insn [83.64%] 597,275,583 branches # 139.464 M/sec [83.70%] 8,960,541 branch-misses # 1.50% of all branches [83.65%] 10.128990264 seconds time elapsed lpq83:~# ./ethtool -K eth0 tx-nocache-copy off lpq83:~# perf stat ./netperf -H lpq84 -c MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to lpq84.prod.google.com () port 0 AF_INET Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % S % U us/KB us/KB 87380 16384 16384 10.00 9412.45 2.15 -1.00 0.449 -1.000 Performance counter stats for './netperf -H lpq84 -c': 2847.375441 task-clock # 0.281 CPUs utilized 11,632 context-switches # 0.004 M/sec 49 CPU-migrations # 0.017 K/sec 354 page-faults # 0.124 K/sec 7,646,889,749 cycles # 2.686 GHz [83.34%] 6,115,050,032 stalled-cycles-frontend # 79.97% frontend cycles idle [83.31%] 1,726,460,071 stalled-cycles-backend # 22.58% backend cycles idle [66.55%] 2,079,702,453 instructions # 0.27 insns per cycle # 2.94 stalled cycles per insn [83.22%] 363,773,213 branches # 127.757 M/sec [83.29%] 4,242,732 branch-misses # 1.17% of all branches [83.51%] 10.128449949 seconds time elapsed CC: Tom Herbert <therbert@google.com> Signed-off-by:
Benjamin Poirier <bpoirier@suse.de> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Jiri Pirko authored
When lo is brought up, new ifa is created. Then, devconf and neigh values bitfield should be set so later changes of default values would not affect lo values. Note that the same behaviour is in ipv6. Also note that this is likely not an issue in many distros (for example Fedora 19) because userspace sets address to lo manually before bringing it up. Signed-off-by:
Jiri Pirko <jiri@resnulli.us> Signed-off-by:
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FX Le Bail authored
This change allows to follow a recommandation of RFC4942. - Add "anycast_src_echo_reply" sysctl to control the use of anycast addresses as source addresses for ICMPv6 echo reply. This sysctl is false by default to preserve existing behavior. - Add inline check ipv6_anycast_destination(). - Use them in icmpv6_echo_reply(). Reference: RFC4942 - IPv6 Transition/Coexistence Security Considerations (http://tools.ietf.org/html/rfc4942#section-2.1.6) 2.1.6. Anycast Traffic Identification and Security [...] To avoid exposing knowledge about the internal structure of the network, it is recommended that anycast servers now take advantage of the ability to return responses with the anycast address as the source address if possible. Signed-off-by:
Francois-Xavier Le Bail <fx.lebail@yahoo.com> Acked-by:
Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by:
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Wei Yongjun authored
Fix to return a negative error code from the error handling case instead of 0. Fixes: 837052d0 ('net/mlx4_en: Add netdev support for TCP/IP offloads of vxlan tunneling') Signed-off-by:
Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by:
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Hayes Wang authored
- Replace pr_warn_ratelimited() with net_ratelimit() and netdev_warn(). - Adjust the algnment of some messages. - Remove the peroid. - Fix some messages don't have terminating newline. Signed-off-by:
Hayes Wang <hayeswang@realtek.com> Signed-off-by:
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David S. Miller authored
> as reported for linux-next of Dec.20, 2013 > when CONFIG_NEED_DMA_MAP_STATE is not enabled: > > drivers/net/ethernet/brocade/bna/bnad.c: In function 'bnad_start_xmit': > drivers/net/ethernet/brocade/bna/bnad.c:3074:26: error: 'struct bnad_tx_vector' has no member named 'dma_len' Reported-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
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Eric Dumazet authored
GRO/GSO layers can be enabled on a node, even if said node is only forwarding packets. This patch permits GSO (and upcoming GRO) support for GRE encapsulated packets, even if the host has no GRE tunnel setup. Signed-off-by:
Eric Dumazet <edumazet@google.com> Cc: H.K. Jerry Chu <hkchu@google.com> Signed-off-by:
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Hauke Mehrtens authored
This fixes some typos found by Sergei. Reported-by:
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by:
Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/jesse/openvswitchDavid S. Miller authored
Jesse Gross says: ==================== [GIT net-next] Open vSwitch Open vSwitch changes for net-next/3.14. Highlights are: * Performance improvements in the mechanism to get packets to userspace using memory mapped netlink and skb zero copy where appropriate. * Per-cpu flow stats in situations where flows are likely to be shared across CPUs. Standard flow stats are used in other situations to save memory and allocation time. * A handful of code cleanups and rationalization. ==================== Signed-off-by:
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- 06 Jan, 2014 31 commits
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Stephen Hemminger authored
Several functions and datastructures could be local Found with 'make namespacecheck' Signed-off-by:
Stephen Hemminger <stephen@networkplumber.org> Signed-off-by:
Jesse Gross <jesse@nicira.com>
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Thomas Graf authored
The copy & csum optimization is no longer present with zerocopy enabled. Compute the checksum in skb_gso_segment() directly by dropping the HW CSUM capability from the features passed in. Signed-off-by:
Thomas Graf <tgraf@suug.ch> Signed-off-by:
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Thomas Graf authored
Use of skb_zerocopy() can avoid the expensive call to memcpy() when copying the packet data into the Netlink skb. Completes checksum through skb_checksum_help() if not already done in GSO segmentation. Zerocopy is only performed if user space supported unaligned Netlink messages. memory mapped netlink i/o is preferred over zerocopy if it is set up. Cost of upcall is significantly reduced from: + 7.48% vhost-8471 [k] memcpy + 5.57% ovs-vswitchd [k] memcpy + 2.81% vhost-8471 [k] csum_partial_copy_generic to: + 5.72% ovs-vswitchd [k] memcpy + 3.32% vhost-5153 [k] memcpy + 0.68% vhost-5153 [k] skb_zerocopy (megaflows disabled) Signed-off-by:
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Thomas Graf authored
Allows removing the net and dp_ifindex argument and simplify the code. Signed-off-by:
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Thomas Graf authored
Drop user features if an outdated user space instance that does not understand the concept of user_features attempted to create a new datapath. Signed-off-by:
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Thomas Graf authored
Signed-off-by:
Daniel Borkmann <dborkman@redhat.com> Signed-off-by:
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Thomas Graf authored
Make the skb zerocopy logic written for nfnetlink queue available for use by other modules. Signed-off-by:
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Wei Yongjun authored
Remove duplicated include. Signed-off-by:
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Daniel Borkmann authored
As we're only doing a kfree() anyway in the RCU callback, we can simply use kfree_rcu, which does the same job, and remove the function rcu_free_sw_flow_mask_cb() and rcu_free_acts_callback(). Signed-off-by:
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Pravin B Shelar authored
With mega flow implementation ovs flow can be shared between multiple CPUs which makes stats updates highly contended operation. This patch uses per-CPU stats in cases where a flow is likely to be shared (if there is a wildcard in the 5-tuple and therefore likely to be spread by RSS). In other situations, it uses the current strategy, saving memory and allocation time. Signed-off-by:
Pravin B Shelar <pshelar@nicira.com> Signed-off-by:
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Thomas Graf authored
Use memory mapped Netlink i/o for all unicast openvswitch communication if a ring has been set up. Benchmark * pktgen -> ovs internal port * 5M pkts, 5M flows * 4 threads, 8 cores Before: Result: OK: 67418743(c67108212+d310530) usec, 5000000 (9000byte,0frags) 74163pps 5339Mb/sec (5339736000bps) errors: 0 + 2.98% ovs-vswitchd [k] copy_user_generic_string + 2.49% ovs-vswitchd [k] memcpy + 1.84% kpktgend_2 [k] memcpy + 1.81% kpktgend_1 [k] memcpy + 1.81% kpktgend_3 [k] memcpy + 1.78% kpktgend_0 [k] memcpy After: Result: OK: 24229690(c24127165+d102524) usec, 5000000 (9000byte,0frags) 206358pps 14857Mb/sec (14857776000bps) errors: 0 + 2.80% ovs-vswitchd [k] memcpy + 1.31% kpktgend_2 [k] memcpy + 1.23% kpktgend_0 [k] memcpy + 1.09% kpktgend_1 [k] memcpy + 1.04% kpktgend_3 [k] memcpy + 0.96% ovs-vswitchd [k] copy_user_generic_string Signed-off-by:
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Thomas Graf authored
An insufficent ring frame size configuration can lead to an unnecessary skb allocation for every Netlink message. Check frame size before taking the queue lock and allocating the skb and re-check with lock to be safe. Signed-off-by:
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Thomas Graf authored
Allocates a new sk_buff large enough to cover the specified payload plus required Netlink headers. Will check receiving socket for memory mapped i/o capability and use it if enabled. Will fall back to non-mapped skb if message size exceeds the frame size of the ring. Signed-of-by:
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Jesse Gross authored
Flow lookup can happen either in packet processing context or userspace context but it was annotated as requiring RCU read lock to be held. This also allows OVS mutex to be held without causing warnings. Reported-by:
Justin Pettit <jpettit@nicira.com> Signed-off-by:
Thomas Graf <tgraf@redhat.com>
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Andy Zhou authored
API changes only for code readability. No functional chnages. This patch removes the underscored version. Added a new API ovs_flow_tbl_lookup_stats() that returns the n_mask_hits. Reported by: Ben Pfaff <blp@nicira.com> Reviewed-by:
Andy Zhou <azhou@nicira.com> Signed-off-by:
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Ben Pfaff authored
We won't normally have a ton of flow masks but using a size_t to store values no bigger than sizeof(struct sw_flow_key) seems excessive. This reduces sw_flow_key_range and sw_flow_mask by 4 bytes on 32-bit systems. On 64-bit systems it shrinks sw_flow_key_range by 12 bytes but sw_flow_mask only by 8 bytes due to padding. Compile tested only. Signed-off-by:
Ben Pfaff <blp@nicira.com> Acked-by:
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Ben Pfaff authored
Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller authored
Conflicts: drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c net/ipv6/ip6_tunnel.c net/ipv6/ip6_vti.c ipv6 tunnel statistic bug fixes conflicting with consolidation into generic sw per-cpu net stats. qlogic conflict between queue counting bug fix and the addition of multiple MAC address support. Signed-off-by: -
Jamal Hadi Salim authored
action flushing missaccounting Account only for deleted actions Signed-off-by:
Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by:
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Jamal Hadi Salim authored
Remove unnecessary checks for act->ops (suggested by Eric Dumazet). Signed-off-by:
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sfeldma@cumulusnetworks.com authored
Use DEVICE_ATTR_RO/RW macros to simplify bridge sysfs attribute definitions. Signed-off-by:
Scott Feldman <sfeldma@cumulusnetworks.com> Signed-off-by:
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Curt Brune authored
br_multicast_set_hash_max() is called from process context in net/bridge/br_sysfs_br.c by the sysfs store_hash_max() function. br_multicast_set_hash_max() calls spin_lock(&br->multicast_lock), which can deadlock the CPU if a softirq that also tries to take the same lock interrupts br_multicast_set_hash_max() while the lock is held . This can happen quite easily when any of the bridge multicast timers expire, which try to take the same lock. The fix here is to use spin_lock_bh(), preventing other softirqs from executing on this CPU. Steps to reproduce: 1. Create a bridge with several interfaces (I used 4). 2. Set the "multicast query interval" to a low number, like 2. 3. Enable the bridge as a multicast querier. 4. Repeatedly set the bridge hash_max parameter via sysfs. # brctl addbr br0 # brctl addif br0 eth1 eth2 eth3 eth4 # brctl setmcqi br0 2 # brctl setmcquerier br0 1 # while true ; do echo 4096 > /sys/class/net/br0/bridge/hash_max; done Signed-off-by:
Curt Brune <curt@cumulusnetworks.com> Signed-off-by:
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Eric Dumazet authored
Sathya Perla posted a patch trying to address following problem : <quote> The vxlan driver sets itself as the socket owner for all the TX flows it encapsulates (using vxlan_set_owner()) and assigns it's own skb destructor. This causes all tunneled traffic to land up on only one TXQ as all encapsulated skbs refer to the vxlan socket and not the original socket. Also, the vxlan skb destructor breaks some functionality for tunneled traffic like wmem accounting and as TCP small queues and FQ/pacing packet scheduler. </quote> I reworked Sathya patch and added some explanations. vxlan_xmit() can avoid one skb_clone()/dev_kfree_skb() pair and gain better drop monitor accuracy, by calling kfree_skb() when appropriate. The UDP socket used by vxlan to perform encapsulation of xmit packets do not need to be alive while packets leave vxlan code. Its better to keep original socket ownership to get proper feedback from qdisc and NIC layers. We use skb->sk to A) control amount of bytes/packets queued on behalf of a socket, but prior vxlan code did the skb->sk transfert without any limit/control on vxlan socket sk_sndbuf. B) security purposes (as selinux) or netfilter uses, and I do not think anything is prepared to handle vxlan stacked case in this area. By not changing ownership, vxlan tunnels behave like other tunnels. As Stephen mentioned, we might do the same change in L2TP. Reported-by:
Sathya Perla <sathya.perla@emulex.com> Signed-off-by:
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Eric Dumazet authored
TCP out_of_order_queue lock is not used, as queue manipulation happens with socket lock held and we therefore use the lockless skb queue routines (as __skb_queue_head()) We can use __skb_queue_head_init() instead of skb_queue_head_init() to make this more consistent. Signed-off-by:
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Hannes Frederic Sowa authored
It does not make sense to create an anycast address for an /128-prefix. Suppress it. As 32019e65 ("ipv6: Do not leave router anycast address for /127 prefixes.") shows we also may not leave them, because we could accidentally remove an anycast address the user has allocated or got added via another prefix. Cc: François-Xavier Le Bail <fx.lebail@yahoo.com> Cc: Thomas Haller <thaller@redhat.com> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by:
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Dan Williams authored
The existing serial state notification handling expected older Option devices, having a hardcoded assumption that the Modem port was always USB interface #2. That isn't true for devices from the past few years. hso_serial_state_notification is a local cache of a USB Communications Interface Class SERIAL_STATE notification from the device, and the USB CDC specification (section 6.3, table 67 "Class-Specific Notifications") defines wIndex as the USB interface the event applies to. For hso devices this will always be the Modem port, as the Modem port is the only port which is set up to receive them by the driver. So instead of always expecting USB interface #2, instead validate the notification with the actual USB interface number of the Modem port. Signed-off-by:
Dan Williams <dcbw@redhat.com> Tested-by:
H. Nikolaus Schaller <hns@goldelico.com> Signed-off-by:
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Veaceslav Falico authored
It returns 0 in case of success, !0 error otherwise. Fix the improper error verification. Fixes: 2c9839c1 ("bonding: add num_grat_arp attribute netlink support") CC: sfeldma@cumulusnetworks.com CC: Jay Vosburgh <fubar@us.ibm.com> CC: Andy Gospodarek <andy@greyhouse.net> Signed-off-by:
Veaceslav Falico <vfalico@redhat.com> Acked-by:
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hayeswang authored
Replace the boolean value with the error code for the return value of the rtl_ops_init(). Signed-off-by:
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hayeswang authored
Some information of the device may be used in other functions. Move the relative code to make sure it would be initialzed correctly before using it. Signed-off-by:
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hayeswang authored
Replace the tabs of the variables declaration with the spaces. Signed-off-by:
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Guenter Roeck authored
With arm:allmodconfig, building the Teles PCI driver fails with telespci.c:294:2: error: #error "not running on big endian machines now" Similar, building the driver for HFC PCI-Bus cards fails with hfc_pci.c:1647:2: error: #error "not running on big endian machines now" Remove the big endian cpp check from both drivers to fix the build errors. Signed-off-by:
Guenter Roeck <linux@roeck-us.net> Signed-off-by:
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