Commit 27082ee1 authored by Vineet Gupta's avatar Vineet Gupta Committed by David S. Miller

ethernet/arc/arc_emac: Fix huge delays in large file copies

copying large files to a NFS mounted host was taking absurdly large
time.

Turns out that TX BD reclaim had a sublte bug.

Loop starts off from @txbd_dirty cursor and stops when it hits a BD
still in use by controller. However when it stops it needs to keep the
cursor at that very BD to resume scanning in next iteration. However it
was erroneously incrementing the cursor, causing the next scan(s) to
fail too, unless the BD chain was completely drained out.

[ARCLinux]$ ls -l -sh /disk/log.txt
 17976 -rw-r--r--    1 root     root       17.5M Sep  /disk/log.txt

========== Before =====================
[ARCLinux]$ time cp /disk/log.txt /mnt/.
real    31m 7.95s
user    0m 0.00s
sys     0m 0.10s

========== After =====================
[ARCLinux]$ time cp /disk/log.txt /mnt/.
real    0m 24.33s
user    0m 0.00s
sys     0m 0.19s
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com> (commit_signer:3/4=75%)
Cc: "David S. Miller" <davem@davemloft.net> (commit_signer:3/4=75%)
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: arc-linux-dev@synopsys.com
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7bf66305
...@@ -149,8 +149,6 @@ static void arc_emac_tx_clean(struct net_device *ndev) ...@@ -149,8 +149,6 @@ static void arc_emac_tx_clean(struct net_device *ndev)
struct sk_buff *skb = tx_buff->skb; struct sk_buff *skb = tx_buff->skb;
unsigned int info = le32_to_cpu(txbd->info); unsigned int info = le32_to_cpu(txbd->info);
*txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
if ((info & FOR_EMAC) || !txbd->data) if ((info & FOR_EMAC) || !txbd->data)
break; break;
...@@ -180,6 +178,8 @@ static void arc_emac_tx_clean(struct net_device *ndev) ...@@ -180,6 +178,8 @@ static void arc_emac_tx_clean(struct net_device *ndev)
txbd->data = 0; txbd->data = 0;
txbd->info = 0; txbd->info = 0;
*txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
if (netif_queue_stopped(ndev)) if (netif_queue_stopped(ndev))
netif_wake_queue(ndev); netif_wake_queue(ndev);
} }
......
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