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SubjectRe: [PATCH] fix sata_sil quirk
On Tue, Jun 22, 2004 at 04:29:08PM -0400, Ricky Beam wrote:
> On Tue, 22 Jun 2004, Jeff Garzik wrote:
> >Here's my suggested fix... good catch Ricky.
>
> And I don't even know why I looked at max_sectors :-) (I need more Dew.)
>
> >Yes, unfortunately performance will be dog slow.
>
> Well, at least puppy slow...
> Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
> sda 1811.65 0.00 9629.85 0 577887
> sdb 1807.15 0.00 9629.60 0 577872
> sdc 1807.25 0.00 9629.86 0 577888
> sdd 1807.05 0.00 9629.86 0 577888
> md_d0 14444.64 0.00 48148.84 0 2889412
> md_d0p2 9629.78 0.00 38519.11 0 2311532
> (over 60sec, 8M O_DIRECT accesses, 128 stripes * 16k RAID0)
>
> Without the MOD15 hack, the numbers are 2x higher, but they stop after
> a few minutes :-)

Stability first!


> >I've got contacts at Silicon Image, and have been meaning to bug them
> >for a "real fix" for a while. It is rumored that there is a much better
> >fix, which allows full performance while at the same time not killing
> >your SATA drive due to odd-sized SATA frames on the wire.
>
> Ask them what they do in their driver? (the linux one and the windows one)
> Looking at the linux driver, the mod15 quirk is there, but there doesn't
> appear to be any associated device list. (I've already post the single
> Maxtor device listed.) FreeBSD detects the stall, resets the chip and
> hopes that clears the problem. (People are not happy about that.)

I just poked them. I'm not satisfied with what any Linux or FreeBSD
driver does, I want to Get It Right(tm) :) I'm willing to bet that
their Linux driver does mod15 only because they didn't know kernel
internals that well.

Jeff



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