Date: Mon, 5 Jul 1999 23:59:20 +0400 (MSD) From: Dmitry Flitmann <dflit@nns.ru> To: freebsd-smp@freebsd.org Subject: Intel SC450NX hangs under high disk/memory load (2) Message-ID: <QBOwGWt0D3ED@gera.nix.nns.ru>
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Hi there - again :) I've read kern/11330 bug report from the GNATS database, and tried to compile kernel which uses only 512M RAM. Everything seems to work fine. Any ideas - are there any problems with memory over 512M - either kernel, or maybe some drivers/controllers? >We've got a "fast" computer for our database: >Intel SC450NX, 2xXeon/500MHz/512K cache, >1G RAM (4x256 50ns ECC EDO Buffered DRAM from Samsung), SymBios U2W SCSI onboard, >2xPCI, 3x18G Seagate Cheetah, >OS - FreeBSD 3.2-STABLE - also tried 3.1,3.2-RELEASE, 4.0-CURRENT. > >At first, we had to patch NCR driver - then it worked fine for some time. > >Under high load disks/memory load (copying a large directory tree from >one disk to another - ~200Mb, ~150K files) a problem appears - >after ~15 minutes of hard work the system hangs - >it does not create any new processes anymore. > >When we try ktrace, it shows last operation "namei" (while opening >file for reading). > >3.2-RELEASE & -STABLE & 4.0-CURRENT die silently, >3.1 reports "Page fault while in kernel mode". > >fault virtual address diffes, once it was 0x0. > >Our first idea was that the problem is in a patched ncr driver, so we >have replaced SymBios with Adaptec 2940U2W, but effect persists. > >CPU load is not very high, there are not a lot of processes, >and no one keeps a lot of files open simultaneously. >? >MAXUSERS is 512 (or 256) > >We tried both SMP and single-processor kernels. Sincerely, Dmitry Flitman National News Service/National Electronic Library. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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