diff options
| author | Michael S. Tsirkin <mst@dev.mellanox.co.il> | 2007-05-28 14:37:27 +0300 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2007-05-29 16:07:09 -0700 |
| commit | ec56dc0b7f6c3fec20bbc2e98ff1a06edf2fc9b9 (patch) | |
| tree | 3bb5379d1bc2cd42526fe3d97b728f0d743bca30 /drivers/char/mwave/3780i.c | |
| parent | 8b7e15772a286d0ef8e4f8eca422ce5368b6fa97 (diff) | |
IPoIB/cm: Fix performance regression on Mellanox
commit 518b1646 ("IPoIB/cm: Fix SRQ WR leak") introduced a severe
performance regression on Mellanox cards, because keeping a QP in the
error state for extended periods of time moves hardware to the slow
path (until the QP is destroyed). For example, MPI latency goes from
~3 usecs to ~7 usecs.
Fix this by posting a send WR on one of the QPs that are being
flushed, instead of using a separate drain QP that is kept in the
error state.
This fixes bug <https://bugs.openfabrics.org/show_bug.cgi?id=636>,
reported and bisected by Scott Weitzenkamp at Cisco and debugged by
Sasha Mikheev at Voltaire.
Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/char/mwave/3780i.c')
0 files changed, 0 insertions, 0 deletions