Date: Wed, 14 Jan 2004 14:10:47 +0000 From: ict technician <ict@cardinalnewman.coventry.sch.uk> To: Ari Suutari <ari@suutari.iki.fi>, Karl Pielorz <kpielorz@tdx.co.uk>, freebsd-stable@freebsd.org Subject: Re: Adaptect raid performance with FreeBSD Message-ID: <200401141410.47630.ict@cardinalnewman.coventry.sch.uk> In-Reply-To: <200401141527.11930.ari@suutari.iki.fi> References: <200401141453.50150.ari@suutari.iki.fi> <741002750.1074086443@rainbow> <200401141527.11930.ari@suutari.iki.fi>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wednesday 14 January 2004 1:27 pm, Ari Suutari wrote: > Hi, > > On Wednesday 14 January 2004 15:20, Karl Pielorz wrote: > > > So, I get only about 25MB/s. Shouldn't I be getting something > > > like 70 MB/s, or even more since there are two disks that > > > can server read requests ? > > > > Hmmm, what happens if you run two of those at once? > > Running 5 dd's at once gives in iostat: > > tty da0 da1 acd0 cpu > tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id > 1 146 0.00 0 0.00 64.00 473 29.58 0.00 0 0.00 0 0 1 1 98 > 0 38 0.00 0 0.00 64.00 625 39.06 0.00 0 0.00 0 0 2 1 97 > 0 38 0.00 0 0.00 64.00 492 30.76 0.00 0 0.00 0 0 2 1 97 > 0 38 0.00 0 0.00 64.00 506 31.62 0.00 0 0.00 0 0 1 0 98 > 0 38 0.00 0 0.00 64.00 495 30.94 0.00 0 0.00 0 0 1 1 98 > > The peak seems to be 39 Mb/s. > > > But, I can't remember seeing adjusting it making any real-world > > difference - what happens if you max it out (e.g. 128, or 256)? > > I'll have to try this. However, I also doubt that it is not going > to change anything. > > Ari S. Where's the other CPU? What's da0 - send dmesg output -- i j hart ICT Technician Cardinal Newman Catholic School & Community College
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200401141410.47630.ict>