Date: Thu, 24 Oct 2002 09:58:22 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Kirk McKusick <mckusick@FreeBSD.org> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/fs/specfs spec_vnops.c src/sys/kern subr_disk.c src/sys/ufs/ffs ffs_snapshot.c Message-ID: <20021024145822.GA69650@dan.emsphone.com> In-Reply-To: <200210220059.g9M0xnWm049023@repoman.freebsd.org> References: <200210220059.g9M0xnWm049023@repoman.freebsd.org>
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In the last episode (Oct 21), Kirk McKusick said: > mckusick 2002/10/21 17:59:49 PDT > > Modified files: > sys/fs/specfs spec_vnops.c > sys/kern subr_disk.c > sys/ufs/ffs ffs_snapshot.c > Log: > This checkin reimplements the io-request priority hack in a way > that works in the new threaded kernel. It was commented out of I think this cure is worse than the disease. Background fsck times on my system went from 10 minutes to an hour, and niced processes that want to do any disk I/O at all run at a glacial speed. Try running "nice find /" on an otherwise-idle system, for example. Don't bother running anything at nice -20 :) If this stays in, I suggest it be enabled via a sysctl that fsck turns off when it's done, or maybe even be tied to processes named "fsck_ufs", so it doesn't bog down the whole system even after fsck is done. -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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