Date: Wed, 30 Jun 1999 20:54:30 +0400 (MSD) From: dflit@nns.ru To: FreeBSD-gnats-submit@freebsd.org Subject: kern/12466: Fast system hangs under high FS load Message-ID: <199906301654.UAA02272@lana.nix.nns.ru>
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>Number: 12466 >Category: kern >Synopsis: Fast system hangs under high FS load >Confidential: no >Severity: critical >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Jun 30 10:00:01 PDT 1999 >Closed-Date: >Last-Modified: >Originator: Dmitry Flitmann >Release: FreeBSD 3.2-STABLE i386 >Organization: National Electronic Library, Moscow, Russia >Environment: Intel Sc450NX, 2xXeon 500Mhz/512K cache, 1G RAM, SymBios/NCR 53c896 u2w SCSI (also tried Adaptec 2940U2W), 3xSEAGATE ST318203LC (Cheetah) disks. OS: FreeBSD 3.2-RELEASE, 3.2-STABLE, 4.0-CURRENT (3.2 - with "Current" NCR driver) either in SMP mode or not. >Description: System hangs while copying a large tree of small files between two disks (~150Mb, 200'000 files). No diagnostic is given. No new processes can be created, already running ones - continue running until any disk operation attempt. We tried different SCSI controllers (symbios 53c896 & adaptec 2940U2W), different kernels (RELEASE/Current/Stable, with or without SMP). ktrace shows last operation - "namei" while opening file for reading. When we launch some serious background job, everything seems to work fine (slower, of course). We think it is a filesystem problem with locking/delays/etc, which appears only on a fast systems. >How-To-Repeat: Try copying a large tree of small files from one disk to another on an idle system (cp -RPp /ar/archive /ar1/ ) >Fix: workaround - to slow down system by running a large background job. >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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