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xen-users
[Xen-users] Poor NFS Perofrmance on Dom0 Storage to native DomU
I set up Dom0 and a couple of DomU all with Suse Enterprise 11 SP1 on a DELL
PowerEdge R710.
I then NFS export a SATA 2TB disk on Dom0 to the 2 DomU guests.
>From the 2 DomU guests, I can only get about 2MBytes/s using dd tests (with dd
>if=/dev/zero bs=1M count=1000).
I doubt the problem is on NFS, because I set up similar Dom0 and DomU on two
other DECLL PowerEdge R710s.
>From these DomUs, I can get about 90MB/s on the same NFS mounted storage.
So the problem seems to be relating how the Dom0 communicates with its native
DomU guests.
I check this using iperf, but found their speeds are in multiple of Gbits/s in
both directions -
the Dom0 has a 10G dual port Ethernet card. Iperf also give similar figures
with DomUs from other physical servers.
I checked through the Suse Enterprise doc on virtualisation, but cannot find
any clue to explain why that is the case.
Does anyone has any idea why?
Thanks.
Peter
--
Scanned by iCritical.
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