Date: Tue, 19 Jun 2001 05:13:52 -0700 From: "Rick Moore" <rick@geckobot.com> To: "'Ted Mittelstaedt'" <tedm@toybox.placo.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: <000201c0f8b9$4ea26e40$04fea8c0@patches> In-Reply-To: <001001c0f88c$cb1c18e0$1401a8c0@tedm.placo.com>
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Hi Ted! I am under the impression that I was running UDMA before, but I don't ever recall verifying it. Sorry I don't have a more definitive answer. Using sysctrl I've confirmed that I'm running UDMA now... Rick > -----Original Message----- > From: Ted Mittelstaedt [mailto:tedm@toybox.placo.com] > Sent: Monday, June 18, 2001 11:55 PM > To: rick@geckobot.com; Erik Trulsson > Cc: freebsd-questions@FreeBSD.ORG > Subject: RE: Significant Performance Drop during 4.0-4.3 Upgrade > > > 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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