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<font face="Helvetica, Arial, sans-serif">Hello everyone,<br>
<br>
I am sharing my zfs via NFS to a couple of OVM nodes. I noticed
really bad NFS read performance, when rsize goes beyond 128k,
whereas the performance is just fine at 32k. The issue is, that
the ovs-agent, which is performing the actual mount, doesn't
accept or pass any NFS mount options to the NFS server. To give
some numbers, a rsize of 1mb results in a read throughput of
approx. 2Mb/s, whereas a rsize of 32k gives me 110Mb/s. Mounting a
NFS export from a OEL 6u4 box has no issues with this, as the read
speeds from this export are 108+MB/s regardles of the rsize of the
NFS mount.<br>
<br>
The OmniOS box is currently connected to a 10GbE port at our core
6509, but the NFS client is connected through a 1GbE port only.
MTU is at 1500 and can currently not be upped.<br>
Anyone having a tip, why a rsize of 64k+ will result in such a
performance drop?<br>
<br>
Thanks,<br>
budy<br>
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