# [OmniOS-discuss] Slow NFS speeds at rsize > 128k

Stephan Budach stephan.budach at JVM.DE
Wed Jan 7 10:28:08 UTC 2015

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    Hello everyone,

    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.

    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.
    Anyone having a tip, why a rsize of 64k+ will result in such a
    performance drop?

    Thanks,
    budy

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