Date: Mon, 12 Mar 2001 21:36:27 +0100 (CET) From: Soren Schmidt <sos@freebsd.dk> To: oberman@es.net (Kevin Oberman) Cc: mobile@FreeBSD.ORG, stable@FreeBSD.ORG Subject: Re: Disk I/O problem in 4.3-BETA Message-ID: <200103122036.VAA99695@freebsd.dk> In-Reply-To: <200103122031.f2CKVRs19327@ptavv.es.net> from Kevin Oberman at "Mar 12, 2001 12:31:27 pm"
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It seems Kevin Oberman wrote: > I'm not too sure if this belongs in mobile or stable. I reported the > problem last week, but have seen no comments. Either it's something > unique to my system (or my hardware) or people have not been doing > large disk copy operations. > > My disk I/O performance has tanked after a cvsup on March 1. > Subsequent updates have not made a difference. Some of this might be due to write caching being turned off as default now, this was done due to "popular demand" because write caching can hose your filesystem on a power outage. > Specifics: System ran normally until the March 1 cvsup. The prior > cvsup was February 24. > > Prior to March 1 I could dd a 4 GB slice in 580 seconds (or a bit > under 10 minutes). After March 1 the same exact command took just > under 40 minutes to complete. The same was seen copying a 2 GB > slice. It increased from 5 minutes to 20 minutes. No kernel > configuration changes were made. This is worse than expected, try to use option ATA_ENABLE_WC and see what gives, if its not back to normal we have to look elsewhere. -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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