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Date: Thu, 8 Dec 2005 20:05:37 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: =?ISO-8859-1?Q?Sebastian_K=E4rgel?= <mailing@wodkahexe.de>
Subject: Re: 2.6.{14,15-rc4} harddrive cache not detected
Cc: linux-kernel@vger.kernel.org
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On 12/8/05, Sebastian Kärgel <mailing@wodkahexe.de> wrote:
> Hello,
>
> after installing a new harddrive, the kernel does no longer detect the
> harddrives cache.
>
> Old one:
> ide0: BM-DMA at 0x1100-0x1107, BIOS settings: hda:DMA, hdb:pio
> hda: ST94019A, ATA DISK drive
> hda: 78140160 sectors (40007 MB) w/2048KiB Cache, CHS=16383/255/63, UDMA
> (33)
>
> New one:
> ide0: BM-DMA at 0x1100-0x1107, BIOS settings: hda:DMA, hdb:pio
> hda: TOSHIBA MK4025GAS, ATA DISK drive
> hda: 78140160 sectors (40007 MB), CHS=65535/16/63, UDMA(33)
>
> Note, that there is nothing printed about the cache size.
> According to the manufactor the new harddrive should have 8mb cache.
> /proc/ide/ide0/hda/cache also show "0"
>
> hdparm gives the following:
> ...
> BuffType=unknown, BuffSize=0kB
> ...
>
> I verified this problem with 2.6.14 and 2.6.15-rc4.

I think that I've seen before some other Toshiba
disks that incorrectly report cache size.

Could you send /proc/ide/hda/identify?

Bartlomiej