Date: Fri, 28 Jun 2002 13:56:54 -0600 From: "Long, Scott" <Scott_Long@adaptec.com> To: "'Terry Lambert'" <tlambert2@mindspring.com>, Matthew Dillon <dillon@apollo.backplane.com> Cc: Julian Elischer <julian@elischer.org>, FreeBSD current users <current@freebsd.org>, "'kirk@mckusick.com'" <kirk@mckusick.com> Subject: RE: something funny with soft updates? Message-ID: <2C7CBDC6EA58D6119E4A00065B3A24CB0463ED@btcexc01.btc.adaptec.com>
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Terry Lambert wrote: > Matthew Dillon wrote: > > :there may not be anything wrong but I expected more improvement. > > :I remember that when I first committed softupdates it made > a noticable > > :difference.... > > > > Julian, please note that a buildworld does *NOT* > seriously exercise > > the filesystem. I/O ops are mostly reads. The only area where > > softupdates might have a major effect would be the rm -rf of the > > object tree at the beginning. > > I still want to know why his KSE numbers were better than the > non-KSE numbers when KSE was not using soft updates, and they > are the same, now that he *is* using soft updates. > > In general, there is (was?) a positive difference in buildworld > times when using soft updates, and Julian seems to have now > demonstrated that this is no longer the case. > > It would be interesting to find out what broke and who broke it, > which is what I think he's asking, and recover the speedup, and > find out if it's all in the object tree delete, or not (I think > that Julian starts without an object tree for this masurement, > right?). > > Maybe the difference in speed is related to the UFS2 commit? > > -- Terry > I'm seeing similar weirdness in 4.6-STABLE. It seems to be especially pronounced on RAID arrays (irregardless of hardware vs software RAID). Memory size doesn't seem to make a difference, as an unloaded 2GB machine of mine behaves in exactly the same way. Scott To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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