Erez Zilber wrote: > Hi, > > I'm running some performance tests with open-iscsi (iops & throughput). > With open-iscsi over TCP, I see very low numbers: > > * iops: READ - 20000, WRITE - 13000 > * throughput: READ - 185, WRITE - 185 > > In open-iscsi.org, I see much higher numbers. Did anyone measure > open-iscsi performance lately? Can you share your numbers? Which
Yeah, I have been running tests for a while. What test program are you using, what io sizes, and what io scheduler and kernel and what nic module? And what are the throughput values in? Is that 185 KB/s. With smaller IOs I get really bad iop numbers. We just talked about this on the list. For throughput if I use larger IOs I get this though (this is from some tests I did when I was testing what I was putting in git): disktest -PT -T30 -h1 -K32 -B256k -ID /dev/sdb -D 0:100 | 2007/11/18-12:54:17 | STAT | 4176 | v1.2.8 | /dev/sdb | Write throughput: 117615274.7B/s (112.17MB/s), IOPS 454.0/s. disktest -PT -T30 -h1 -K32 -B256k -ID /dev/sdb | 2007/11/18-12:49:58 | STAT | 3749 | v1.2.8 | /dev/sdb | Read throughput: 96521420.8B/s (92.05MB/s), IOPS 374.6/s. Normally for reads I also get 112 MB/s. For some reason with my home setup where I tool those numbers though, I am getting really bad read numbers. I did a patch to switch the read path to always use a thread and then the throughput went back to 112. Not sure if you are hitting that problem, but I also noticed with some targets and workloads I need to switch to noop instead of cfq or throughput drops to 3-12 MB/s even with large IOs like above. This is using the default values in the iscsid.conf. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-iscsi@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/open-iscsi -~----------~----~----~----~------~----~------~--~---
