Date: Thu, 21 Oct 2004 08:40:57 -0700 From: Kris Kennaway <kris@obsecurity.org> To: fandino <fandino@ng.fadesa.es> Cc: freebsd-current@freebsd.org Subject: Re: FreeBSD 5.3b7and poor ata performance Message-ID: <20041021154057.GB640@xor.obsecurity.org> In-Reply-To: <417766B0.1020409@ng.fadesa.es> References: <41715E7F.7060509@ng.fadesa.es> <20041018100045.f8koww0skcco0woo@www.sweetdreamsracing.biz> <4173D66F.6010200@DeepCore.dk> <4173F2E9.7010407@ng.fadesa.es> <417406E3.9010706@DeepCore.dk> <4174FD04.8040000@ng.fadesa.es> <20041019104525.ikgw8kcw8sw480os@www.sweetdreamsracing.biz> <41753A8F.4040809@ng.fadesa.es> <6.1.2.0.0.20041019121353.026745f8@64.7.153.2> <417766B0.1020409@ng.fadesa.es>
index | next in thread | previous in thread | raw e-mail
[-- Attachment #1 --] On Thu, Oct 21, 2004 at 09:35:12AM +0200, fandino wrote: > Mike Tancsa wrote: > >Its strange that you do not see any difference in speed when reading > >from the device directly vs a file ? I see quite a difference in my > >setup on a RELENG_5 box and not so much a difference on a RELENG_4 box. > >Perhaps as someone suggested, the GEOM layer ? > > > >e.g. create a file with junk larger than your RAM. (the machine below > >has 256M) > > -- same mobo and same disks -- > > OpenBSD 3.5: > > dd if=/mnt/aa of=/dev/null bs=1024k count=1024 > 1024+0 records in > 1024+0 records out > 1073741824 bytes transferred in 18.743 secs (57287584 bytes/sec) > > > FreeBSD 5.3rc1: > > # dd if=/mnt/aa of=/dev/null bs=1024k count=1024 > 1024+0 records in > 1024+0 records out > 1073741824 bytes transferred in 42.215597 secs (25434719 bytes/sec) BTW, others have asked that you not use dd as your "benchmark", because it's not benchmarking anything relevant for real-world use of the disk. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQFBd9iJWry0BWjoQKURAocpAKDzSp5pL8SChDF49MeWUQo8JtTV7QCg5Xcs WzTvDTi3AM4kxaVUZT8yAUk= =oxeb -----END PGP SIGNATURE-----help
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20041021154057.GB640>