Date: Wed, 21 Jul 2004 01:46:12 +0200 From: "jesk" <jesk@killall.org> To: <freebsd-current@freebsd.org> Cc: Robert Watson <rwatson@freebsd.org> Subject: Re: I/O or Threading Suffer Message-ID: <056801c46eb3$bd0e2a40$45fea8c0@turbofresse>
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hi, i figured out that the performanceloss only really occur if the process is heavily writing on the filesystem. dd if=/dev/zero of=/dev/null bs=128k doesnt hurt much in responsetime of parallel processes, but when dd operates on the filesystem with of=foo every process will be affect in executiontime. a simple ps or ls meanwhile dding onto the disk will be hang for dozen of seconds. i tested it with 4BSD and ULE with and without Preemption.
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