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 <[EMAIL PROTECTED]> 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). > > Its documented at: > > http://homepages.paradise.net.nz/markir/freebsd/ > > I wanted to play with Docbook as well :-), so excuse the "book" format > (might be a few typos too). > > 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. > > 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. > > vfs.read_max=16 > > Hope this provides some interest, again - gotta qualify, this is all one > man's experiment on his hardware... > > Cheers > > Mark > > P.s : of course, it would be nice if 5.x (or perhaps more importantly > 6.x) was *faster* than 4.10.... > > 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=/dev/zero of=/zerofile bs=1024 count=1024k; > > this is reality poor! > > > > > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "[EMAIL PROTECTED]" > _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
