Date: Fri, 19 Nov 2004 14:16:51 +1100 (EST) From: Luke <lukem@cse.unsw.EDU.AU> To: Aaron Glenn <aaron.glenn@gmail.com> Cc: "lukem.freebsd@cse.unsw.edu.au" <lukem.freebsd@cse.unsw.edu.au> Subject: Re: I've ran out of ideas Message-ID: <Pine.LNX.4.61.0411191411400.11282@wagner.orchestra.cse.unsw.EDU.AU> In-Reply-To: <18f6019404111817533b93cbba@mail.gmail.com> References: <20041118101026.55888.qmail@web14121.mail.yahoo.com> <20041118105543.10295.qmail@web41208.mail.yahoo.com> <18f6019404111809224fb97c06@mail.gmail.com> <Pine.LNX.4.61.0411191006310.5596@wagner.orchestra.cse.unsw.EDU.AU> <18f6019404111817533b93cbba@mail.gmail.com>
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On Thu, 18 Nov 2004, Aaron Glenn wrote: >> I would theorise that your web server is probably only issuing fairly >> small disk reads, so your network performance is being bound by the disk. > > That was my first hunch; hence creating a separate partition with > obscene blocksizes (-: Increasing the block size of the disk need not imply that the application is issuing larger reads. >> To test this theory, you could: >> >> * create an mfs partition and serve off it to see what kind of performance >> you can get >> * see if you can tweak the web server to use larger reads and writes. >> >> In your original message you said that increasing the disk block size >> improved performance, which would also indicate that you are being limited >> by disk performance. > > I doubt increasing it even more would help. Law of diminishing returns > and all that; then again I'm no expert. Thoughts? I have not suggested that you increase the blocksize further. Please read the above points again. As Sean pointed out, if your web server supports sendfile then that would be a good option. Your recent post which showed poor performance from /dev/zero does bring the theory that your disk is the bottleneck into question, however you may still find it is worth trying the above suggestions. -- Luke
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