[2519] in linux-scsi channel archive
Re: Adaptec 2940 support
daemon@ATHENA.MIT.EDU (David S. Miller)
Mon Sep 22 17:33:37 1997
Date: Mon, 22 Sep 1997 16:04:09 -0400
From: "David S. Miller" <davem@jenolan.rutgers.edu>
To: Zlatko.Calusic@CARNet.hr
CC: jeff@planetfall.com, linux-scsi@vger.rutgers.edu
In-reply-to: <87lo0pw89a.fsf@atlas.infra.CARNet.hr> (message from Zlatko
Calusic on 22 Sep 1997 19:47:29 +0200)
From: Zlatko Calusic <Zlatko.Calusic@CARNet.hr>
Date: 22 Sep 1997 19:47:29 +0200
Sun Ultra 1 (UltraSparc 143MHz, 64MB RAM, 2.1GB SCSI disk) running
Solaris 2.5.1:
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
100 5080 78.4 5017 14.5 1615 9.1 5055 95.3 5149 11.1 86.3 2.7
And this is the same machine running UltraLinux v2.1.44 (thanks to Dave
Miller) :)
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
200 3117 45.0 3219 11.5 1494 8.7 3331 61.7 3579 7.7 39.9 1.1
Note that %CPU, while doing block I/O, is less than 15%, no matter if
reading or writing, no matter what OS you use!
We can also see that DaveM has some work to do on improving read/write
speed. :)
If you run one of the vger snapshot kernels, you should be getting
numbers more comparable to Solaris. The newer kernels perform DMA
more efficiently on Ultra/SBUS boxes.
Later,
David "Sparc" Miller
davem@caip.rutgers.edu
