Date: Mon, 12 Mar 2001 12:31:27 -0800 From: "Kevin Oberman" <oberman@es.net> To: mobile@freebsd.org Cc: stable@freebsd.org Subject: Disk I/O problem in 4.3-BETA Message-ID: <200103122031.f2CKVRs19327@ptavv.es.net>
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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. 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. The system is an IBM ThinkPad 600E with 192 MB RAM and 12 GB and 6 GB disks. Both disks are UDMA33. All operations were performed after a stand-alone boot with only root mounted and that mounted RO. FreeBSD is on the 2 GB slice with W98 on the 4 GB one. The commands used: dd bs=32k if=/dev/ad0s1 of=/dev/ad2s1 dd bs=32k if=/dev/ad0s2 of=/dev/ad2s2 The FWIW, I subjectively feel that the time to buildworld has also increased, but I really don't recall how long it was taking in the past, so I really don't have a basis for comparison. Is anybody else aware of anything that might be causing this? IS anyone else seeing it at all? R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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