diff options
| author | Mike Christie <michaelc@cs.wisc.edu> | 2005-09-12 21:01:28 -0500 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.(none)> | 2005-09-20 12:30:39 -0500 |
| commit | b13941f635c3119eb02dc29b5248066f934f76be (patch) | |
| tree | 8a7ecba66e92aceb8d91b16eda0cf0820420f1de /fs/block_dev.c | |
| parent | 96bad874e7b047ec1e6fade09acba47fd19211c5 (diff) | |
[SCSI] iscsi: nodelay fix
From: tomof@acm.org
I'm not sure about this. I don't think that NODELAY option hurts
performance. However, open-iscsi does not use MSG_MORE properly with
sendpage, so NODELAY option hurts the open-iscsi performance.
I've attached a patch to fix NODELAY and MSG_MORE problems and the
write performance results with disktest.
I use Opteron boxes connected directly, Chelsio NICs, 1500-byte MTU,
64 KB I/O size, and the iSCSI parameters on open-iscsi web site.
With only NODELAY fix, the performance drops, as you said. On the
other hand, NODELAY and MSG_MORE fixes improve the performance
overall.
Signed-off-by: Alex Aizman <itn780@yahoo.com>
Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'fs/block_dev.c')
0 files changed, 0 insertions, 0 deletions