Date: Fri, 21 May 2004 17:53:45 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Kevin Oberman <oberman@es.net> Cc: freebsd-current@freebsd.org Subject: Re: Disk performance under CURRENT Message-ID: <20040522005345.GA12594@xor.obsecurity.org> In-Reply-To: <20040521224729.680285D0A@ptavv.es.net> References: <20040521224729.680285D0A@ptavv.es.net>
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[-- Attachment #1 --] On Fri, May 21, 2004 at 03:47:29PM -0700, Kevin Oberman wrote: > 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. Yes, disk performance sucks on 5.x..this is something phk is planning to work on. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFArqSZWry0BWjoQKURAiCPAJoDdO3kECNWHLgxBJAYH08Y/yRDwgCffsrN 4GGmFJk8QyV0TVll7lTNgx0= =GZpQ -----END PGP SIGNATURE-----
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