Commit 0e2a2e98 authored by Dmitri Epshtein's avatar Dmitri Epshtein Committed by Ben Hutchings

net: mvneta: set real interrupt per packet for tx_done

commit 06708f81 upstream.

Commit aebea2ba ("net: mvneta: fix Tx interrupt delay") intended to
set coalescing threshold to a value guaranteeing interrupt generation
per each sent packet, so that buffers can be released with no delay.

In fact setting threshold to '1' was wrong, because it causes interrupt
every two packets. According to the documentation a reason behind it is
following - interrupt occurs once sent buffers counter reaches a value,
which is higher than one specified in MVNETA_TXQ_SIZE_REG(q). This
behavior was confirmed during tests. Also when testing the SoC working
as a NAS device, better performance was observed with int-per-packet,
as it strongly depends on the fact that all transmitted packets are
released immediately.

This commit enables NETA controller work in interrupt per sent packet mode
by setting coalescing threshold to 0.
Signed-off-by: default avatarDmitri Epshtein <dima@marvell.com>
Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
Fixes aebea2ba ("net: mvneta: fix Tx interrupt delay")
Acked-by: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 3c09ac6e
......@@ -216,7 +216,7 @@
/* Various constants */
/* Coalescing */
#define MVNETA_TXDONE_COAL_PKTS 1
#define MVNETA_TXDONE_COAL_PKTS 0 /* interrupt per packet */
#define MVNETA_RX_COAL_PKTS 32
#define MVNETA_RX_COAL_USEC 100
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment