Hello, I'm testing AoE as Xen storage backend. On my other machines I have CentOS installed and I'd like to use it also as Xen Dom0. Main goal is to use CLVM on top of AoE and share each DomU an own LVM slice.
However, the performance isn't that good from CentOS clients. With AoE module delivered with CentOS write speed is around 15-20 MB/s and with driver version 73 write speed is around 30-40 MB/s and read speed is close to 100 MB/s. When doing write tests I see lots of error and retransmit messages in /dev/etherd/err file. Also I/O wait grows pretty high on AoE target when writing. Weird thing is that when using Opensuse 11.1 as client on exactly same machine write speed is also near to 100 MB/s and at least I haven't noticed anything special on I/O wait or loads. On target I have CentOS 5.4 running with kernel 2.6.18-164.6.1 and on client I have tried with exactly same CentOS version and Opensuse 11.1 with kernel 2.6.27. Both client and target machine has 4 GB RAM. Target has SysKonnect SK-9E21D NIC and client has HP NC110T. Both ends have MTU set to 9000. Currently I have direct link set between them for testing purposes. I have also tested with optimizations mentioned at http://xenaoe.org/Virtualization/wiki/AoEOptimizations but they doesn't seem to make any diffrence. Is there anything I could do or any explanations why performance is poor on CentOS? Best regards, -samuli ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Aoetools-discuss mailing list Aoetools-discuss@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/aoetools-discuss
