Re: pitiful performance of an SATA150 drive

From: Søren Schmidt <sos_at_DeepCore.dk>
Date: Sun, 16 Apr 2006 13:04:20 +0200
On Lør, 2006-04-15 at 21:53 -0400, Mikhail Teterin wrote:
> On Thursday 02 March 2006 14:06, Søren Schmidt wrote:
> = > I noticed a big MFC to dev/ata today and rebuilt the kernel.
> = > Unfortunately, the drive's write-performance did not change. Just FYI...
> = 
> = You are sure you dont have hw.ata.wc turned of ?
> = Other than that I seriously doubt its a fault in ATA...
> 
> This is still a problem with today's 6.1-RC1. hw.ata.wc is `1'.

> What can I do to help you resolve this, Søren? Thanks!

I just tried this on a system as close to the one you have as possible
here in the lab with this result:

atapci3: <SiI 3114 SATA150 controller> port
0xa800-0xa807,0xa400-0xa403,0xa000-0xa007,0x9c00-0x9c03,0x9800-0x980f
mem 0xfdfff000-0xfdfff3ff irq 16 at device 13.0 on pci1
ata6: <ATA channel 0> on atapci3
ata7: <ATA channel 1> on atapci3
ata8: <ATA channel 2> on atapci3
ata9: <ATA channel 3> on atapci3
...
ad1: 78533MB <HDS728080PLA380 PF2OA60A> at ata8-master SATA150

devel# dd if=/dev/ad1 of=/dev/null bs=1m count=200
200+0 records in
200+0 records out
209715200 bytes transferred in 3.470972 secs (60419732 bytes/sec)
devel# dd if=/dev/zero of=/dev/ad1 bs=1m count=200
200+0 records in
200+0 records out
209715200 bytes transferred in 3.513703 secs (59684956 bytes/sec)

That makes me *seriously* doubt that ATA is at fault here...

-Søren
Received on Sun Apr 16 2006 - 09:05:01 UTC

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