Date: Wed, 9 Oct 1996 17:05:40 +0100 (BST) From: Doug Rabson <dfr@render.com> To: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp> Cc: henrich@crh.cl.msu.edu, lite2@freebsd.org Subject: Re: Delayed write patch Message-ID: <Pine.BSF.3.95.961009170321.10204h-100000@minnow.render.com> In-Reply-To: <2389.844870583@sat.t.u-tokyo.ac.jp>
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On Wed, 9 Oct 1996, Hidetoshi Shimokawa wrote: > dfr> > I tried this patch, but there is no performance improvement. > dfr> > It's still around 300KB. > dfr> > > dfr> > tcpdump shows that only one iod is running. > dfr> > dfr> If you change nfs_asyncio to return EIO instead of using a delayed write, > dfr> how many iods are running? > if I start 4 iods, 4 iods are running. If you change nfs_maxdelwri to zero using gdb or ddb, what write performance do you see? That ought to be the same as the nfs_dwrite==0 case. I can't figure out why the other iods should get locked out. Are you sure that all the reqs are made by the same iod? -- Doug Rabson, Microsoft RenderMorphics Ltd. Mail: dfr@render.com Phone: +44 171 734 3761 FAX: +44 171 734 6426
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