Date: Sat, 3 Jul 1999 20:43:37 +0400 (MSD) From: Dmitry Flitmann <dflit@nns.ru> To: freebsd-smp@freebsd.org Subject: Intel SC450NX hangs under high disk/memory load Message-ID: <VLusZVtWG8GF@gera.nix.nns.ru>
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Hi there! 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. sorry for poor English. 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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