Date: Mon, 18 Jun 2001 23:55:15 -0700 From: "Ted Mittelstaedt" <tedm@toybox.placo.com> To: <rick@geckobot.com>, "Erik Trulsson" <ertr1013@student.uu.se> Cc: <freebsd-questions@FreeBSD.ORG> Subject: RE: Significant Performance Drop during 4.0-4.3 Upgrade Message-ID: <001001c0f88c$cb1c18e0$1401a8c0@tedm.placo.com> In-Reply-To: <01061816423505.17965@trap.geckobot.com>
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Just a question, Were you running ULTRA DMA under 4.0 or were you running PIO mode? Ted Mittelstaedt tedm@toybox.placo.com Author of: The FreeBSD Corporate Networker's Guide Book website: http://www.freebsd-corp-net-guide.com >-----Original Message----- >From: owner-freebsd-questions@FreeBSD.ORG >[mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of Rick >Sent: Monday, June 18, 2001 4:43 PM >To: Erik Trulsson >Cc: freebsd-questions@FreeBSD.ORG >Subject: Re: Significant Performance Drop during 4.0-4.3 Upgrade > > >Hi Erik- > >Thanks for responding so quickly! Unless I did something wrong, >that didn't >seem to do the trick. I sure thought it was going to work, though. > >I added the following line to /boot/defaults/loader.conf: > >hw.ata.wc="1" > >...and rebooted but the performance hasn't picked up to where it was with >FreeBSD 4.0. It may have gone up some-- I haven't been tracking >the numbers >very closely. > >By coincidence, one of the three systems was upgraded to FreeBSD >4.3 STABLE >instead of RELEASE, and it too shows roughly the same performance metrics. > >If I didn't do this right, please let me know. Otherwise if you or anyone >has other thoughts, I'd be happy to give them a try. > >Rick > >BTW- I'm not sure it's worth mentioning, but I still don't see any >of this in >the 4.3 RELEASE notes... > > > >On Monday 18 June 2001 14:07, Erik Trulsson wrote: >> On Mon, Jun 18, 2001 at 01:44:23PM -0700, Rick wrote: >> > Hi! >> > >> > I just upgraded 3 servers from 4.0 to 4.3 FreeBSD using >sysinstall, and I >> > noticed that some rm -r operations seemed a little slow after the >> > upgrade. >> > >> > Coincidentally I've been working on an ISAM alternative to B-tree so I >> > have a bunch of performance benchmarks handy. The results: >> > >> > Disk hits are *much* slower after the upgrade. Many times slower, in >> > fact. I also had Berkley DB benchmarks that I was using for comparison >> > and they too were heavily impacted. >> > >> > For the life of me, I can't figure out what the heck happened! >> > SOFTUPDATES were off before the upgrade and I didn't change of the disk >> > tuning. I did tweak my kernel a bit, but nothing should have had this >> > effect-- I just removed a few things that weren't being used like EISA >> > and some network cards. When I examine dmesg everything still seems to >> > be recognized as ULTRA DMA, etc. I've tried putting everything back in >> > my kernel and I've try the GENERIC kernel with no improvements. >> > >> > I've looked through the release notes, etc., and couldn't find >anythingd >> > etailing this problem. Did I miss something? Am I just extra lucky? >> >> Yes, you missed one small thing. Write caching for IDE disks were >> turned off by default in 4.3-RELEASE. It has since been turned back on >> in 4.3-STABLE on since the performance hit was too big. >> (The reason it was turned off is that if you have the write-cache >> turned on can result in serious data-loss if you have a power failure.) >> >> You can turn it back on by setting hw.ata.wc=1 from the loader. >> See the manpages for ata(4) and loader(8) for more information. > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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