Date: Thu, 25 Apr 2013 13:40:07 -0700 From: "Marc G. Fournier" <scrappy@hub.org> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: freebsd-fs@freebsd.org Subject: Re: NFS Performance issue against NetApp Message-ID: <9393AE5A-CDF5-4541-85CC-F402D8652A0F@hub.org> In-Reply-To: <972106612.1125159.1366850215231.JavaMail.root@erie.cs.uoguelph.ca> References: <972106612.1125159.1366850215231.JavaMail.root@erie.cs.uoguelph.ca>
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On 2013-04-24, at 17:36 , Rick Macklem <rmacklem@uoguelph.ca> wrote: >>=20 > For the new client, it defaults to the min(MAXBSIZE, server-max), = where > server-max is whatever the server says is its maximum (also MAXBSIZE = for > the new server). I think the old server uses 32768. > These numbers are for the default tcp mounts. Specify udp (or mntudp) = and > I think the default becomes 16384. >=20 > If you explicitly set rsize=3DN,wsize=3DN on a mount, those sizes will = be > used unless they are greater than min(MAXBSIZE, server-max). MAXBSIZE = is > the limit for the client side buffer cache and server-max is whatever > the server says is its max, so the client never uses a value greater = than > that. >=20 > For readahead, the default is 1. This seems rather small to me and I = think is > in the "from the old days" category. You can set it to > a larger value, although there is an ifdef'd upper limit, which is = what > you'll get if you specify a really large value for readahead. = Admittedly, > if you are using a large rsize,wsize on a low latency LAN, readahead=3D1= > may be sufficient. >=20 > As someone else noted, if you are using head or stable/9, "nfsstat -m" > shows you what is actually being used, for the new client only. 'k, with the Intel card in (igb driver), I've tried various different = mount options =85 64k (default), 32k, 1/2/3 for read ahead =85 all tend = to come ou taround the same 250s to run =85 I'm getting drastic now, = and am reformatting one of the other server (exact same config, but = without the Intel for the first try) with Centos 6.4 =85 test out its = nfsclient =85 see if I get similar results =85=20=
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