Date: Mon, 26 Mar 2012 18:32:24 +0200 From: Sven Brandenburg <sven@crashme.org> To: freebsd-fs@freebsd.org Subject: Re: NFSv3, ZFS, 10GE performance Message-ID: <4F709A18.50907@crashme.org> In-Reply-To: <jkpgt4$v55$1@dough.gmane.org> References: <4F703815.8070809@crashme.org> <jkpgt4$v55$1@dough.gmane.org>
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On 03/26/2012 12:37 PM, Ivan Voras wrote: > You could try modifying the rsize and wsize NFS options (read > mount_nfs(8)), they help with UFS. I tried this a few days ago and fiddling rsize alters performance from "ok" to "terrible". However, you made me revisit this and mount_nfs(8) seems to have a gem in its options: readahead. This did the trick for me and my (long and sequential) reads. While the manpage says its limited to 0-4, the best results were achieved with readahead=8 : 1.1GB/s - which is what I had hoped for. On a tangent: gnu-dd 1GB/s is 10^9 Bytes/s, not 2^30. Yes, I fell for it at first :) The good news is that there was no fiddling on the NFS server side. (Apart from MTU increases, PCI settings and more buffers to get TCP performance to full tilt in the first place) Hopefully, readahead doesn't kill performance for smaller files.. :-) regards, Sven
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