Re: TR: SiI2112 + Seagate + nFroce2: no DMA!

[Eric Wong]

Emmanuel Hislen <hislen@xxxxxxxxxxxxxx> wrote:
> 
> Hi again,
> 
> Here's a more complete report on this issue.
> 
> -1-
> 
> Going to Fedora Core 12.4.22-1.2115.nptl fixed the DMA issue. The 
> Seagate SATA drive (ST3160023AS) came up in DMA mode.
> The speed however (hdparm -t) was 25MB/s, better but still unacceptable.

You have the same drive I have.

> 
> I got the latest Fedora Core: 2.4.22-1.2149.nptl
> 
> Interestingly enough I found out that this release comes with a sata_sil 
> module that is not even in 2.4.24, it was probably ported from 2.6.1 by 
> the Fedora team.
> Anyway I believe this is just a RAID driver, it did not change anything 
> (same as -1-).

sata_sil is the libata driver, it doesn't support "hardware" RAID.
Enable CONFIG_BROKEN to compile it, siimage is the generic ATA driver
(and supposedly the safer of the two, but I've had no problems (yet)
with sata_sil).  

> -5-
> 
> Now I tried kernel 2.6.1: it is worse, it dropped to 14 MB/s !?!?!
> I've seem several similar reports about 2.6.

Try 2.6.2-rc1 using the sata_sil driver, it has a blacklist instead of
punishing all Seagate (and Maxtor) drives, and ST3160023AS is definitely
not blacklisted at all, regardless of chipset revision.  Revision 2 or
newer of the SiI3112 should be fine with all Seagate drives.

warning: your /dev/hdY will become /dev/sdX (probably /dev/sda, in your
case) if you go from the IDE (siimage) driver to a libata (sata_sil)
driver.

-- 
Eric Wong                normalperson@xxxxxxxx
Petta Technology, Inc      eric@xxxxxxxxxxxxxx
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