Re: FreeBSD 5.3b7and poor ata performance

From: John-Mark Gurney <gurney_j_at_resnet.uoregon.edu>
Date: Tue, 26 Oct 2004 16:14:49 -0700
fandino wrote this message on Tue, Oct 26, 2004 at 17:19 +0200:
> John-Mark Gurney wrote:
> >Yep, and I get decent performance:
> 
> could repeat the test setting udma mode to UDMA4?

Sure, though there is only one drive in this machine, so there is no
problems with channel colissions...

> >dmesg clip:
> >atapci0: <VIA 82C686B UDMA100 controller> port 
> >0xc000-0xc00f,0x376,0x170-0x177,0
> >x3f6,0x1f0-0x1f7 at device 7.1 on pci0
> >atapci0: Correcting VIA config for southbridge data corruption bug
> 
> hhhmmm, my dmesg doesn't print the message for the 686B data corruption bug.
> 
> >ata0: channel #0 on atapci0
> >ata1: channel #1 on atapci0
> >ad0: 43979MB <IBM-DTLA-307045/TX6OA60A> [89355/16/63] at ata0-master 
> >UDMA100
> >Transfer rates:
> >        outside:       102400 kbytes in   2.857371 sec =    35837 
> >        kbytes/sec
> >        middle:        102400 kbytes in   3.561157 sec =    28755 
> >        kbytes/sec
> >        inside:        102400 kbytes in   5.635770 sec =    18170 
> >        kbytes/sec

Well, looks like I get similar performance w/ UDMA4 aka UDMA66:
Transfer rates:
        outside:       102400 kbytes in   2.828054 sec =    36209 kbytes/sec
        middle:        102400 kbytes in   3.506356 sec =    29204 kbytes/sec
        inside:        102400 kbytes in   5.641238 sec =    18152 kbytes/sec

Note, I didn't reboot just before switching to UDMA4...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."
Received on Tue Oct 26 2004 - 21:14:59 UTC

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