Date: Sun, 24 Jul 2005 22:48:26 +0100 From: Chris <chrcoluk@gmail.com> To: Mark Kirkwood <markir@paradise.net.nz> Cc: freebsd-stable@freebsd.org Subject: Re: FreeBSD IO Performance (was Re: Quality of FreeBSD) Message-ID: <3aaaa3a050724144831d5cff0@mail.gmail.com> In-Reply-To: <42E099A0.3080101@paradise.net.nz> References: <1dbad31505072105401c06bee6@mail.gmail.com> <42E099A0.3080101@paradise.net.nz>
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Its been mentioned before and most experience the same as you by setting it to 16 a dramatic improvement in the sequential read, I currently run all my 5.x servers like this with no issues as a result. I am curious if the default will ever be changed. Chris On 22/07/05, Mark Kirkwood <markir@paradise.net.nz> wrote: > I happened to have received a 'new' machine, and wanted to see what its > IO system was capable of. So took the opportunity to run 4.10 and 5.4 > against each other a few times. (fresh re-installs each time). >=20 > Its documented at: >=20 > http://homepages.paradise.net.nz/markir/freebsd/ >=20 > I wanted to play with Docbook as well :-), so excuse the "book" format > (might be a few typos too). >=20 > But to cut to the chase, the results were overall very similar - 4.10 > probably a little (4-8%) faster (allowing for run variation). So really > 5.4 is reasonably fast. The actual figures weren't too bad either - > 70-80Mb/s read and writes on a 2 disk ATA array. >=20 > The most interesting thing discovered, was 5.4's "out of the box" > sequential *read* performance was considerably less then 4.10, but could > be brought up to almost the same by setting. >=20 > vfs.read_max=3D16 >=20 > Hope this provides some interest, again - gotta qualify, this is all one > man's experiment on his hardware... >=20 > Cheers >=20 > Mark >=20 > P.s : of course, it would be nice if 5.x (or perhaps more importantly > 6.x) was *faster* than 4.10.... >=20 > Michael Schuh wrote: > > Hi, > > > > Now my question to you : is the performance of ata-related disk-access > > under UFS-Filesystem not important for other application, so that the > > performance can be a half of them that RELENG_4 does? > > > > In fact under RELENG_4 i can write a GIG FIle double as fast as under > > RELENG_5 ! and i would not hear any thing about serial performance or > > that this is not really like the real world, if i syimulate that with: > > > > /usr/bin/time dd if=3D/dev/zero of=3D/zerofile bs=3D1024 count=3D1024k; > > this is reality poor! > > >=20 >=20 >=20 > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
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