Date: Sat, 22 May 2004 03:01:28 +0400 From: Roman Kurakin <rik@cronyx.ru> To: Kevin Oberman <oberman@es.net> Cc: freebsd-current@freebsd.org Subject: Re: Disk performance under CURRENT Message-ID: <40AE8A48.6090802@cronyx.ru> In-Reply-To: <20040521224729.680285D0A@ptavv.es.net> References: <20040521224729.680285D0A@ptavv.es.net>
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Did you turn off things such as WITNESS and other debug? rik Kevin Oberman пишет: >I just ran test of disk writing performance under V4 (STABLE) and V5 >(CURRENT) and was surprised at the difference. > >The test was simple and not at all rigorous. Just a dd bs=256k >if=/dev/zero of=/dev/ad2. This is about the simplest way of dealing with >a disk. No file system or anything else. Just raw data to the device. > >Under STABLE, I get an average of 25 MB/sec to the disk. Under CURRENT, >it drops to 15 MB/sec. I did this because I had noted that it was now >taking over an hour to backup my system disk (40 GB) when it was only >taking 40 minutes when I was running V4.6. The STABLE system was built >yesterday. The CURRENT system last Sunday. > >Any idea why this is so much slower? It looks to me like it must be in >either geom or the disk driver. > >
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