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From: Carsten Heesch <sysconfig@ossafe.org>
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Date: Fri, 28 Jan 2011 10:26:55 +0000
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Subject: Sync performance HAST and ggate/gmirror on Xen
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Hi guys,

Is anybody else using HAST or ggate/gmirror within Xen DomU's?=20

I'm experiencing dreadful performance (sync throughput less than =
1MB/sec) with both replication options, and am not quite sure how to =
troubleshoot that, because the network speed between two DomU's is =
otherwise well beyond 50MB/sec.=20

Logfiles and dmesg don't give any pointers, tcpdump looks clean (no =
bouncing packets, wrong order etc), no collisions or packet loss either =
(according to netstat).


Anyone else experiencing similar problems?


Test setup:
2x FreeBSD/amd64 8.2-RC2 (compiled about a week ago), XENHVM kernel =
(with Janne's patch).
Both DomU's are running on the same physical machine (CentOS 5.5 x86_64 =
with Xen 4.3.3 on Intel i7), their NICs are using the same isolated =
bridge on Dom0.


Cheers
Carsten





Regards,

Carsten Heesch

carsten@heesch.me.uk
mob: +44 7889 129998