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SubjectRe: slowdown on Via ide chipsets with 2.4.15?
On Thu, Nov 22, 2001 at 02:20:31PM -0500, safemode wrote:
> something i just took notice while fixing my computers.
> hdparm -t to test the speed of drives, i have in the past had about 30MB/s
> across all my drives.
> Now, my primary disk, which is the only one on it's channel, gets 19MB/s
> (udma2 speeds). It's an udma4 drive and i've seen it get 30+ on average in
> earlier kernels. My primary master on the promise card gets 30+ still, but
> my slave on the same channel gets 19MB/s even though the master is not being
> used. I know there is to be expected some performance drop, but that much is
> a little disconcerting. I have my atapi devices on the secondary channel of
> my via controller (motherboard) and the second channel on the promise card
> will be used for my new drive.
> The harddrives are configured exactly the way they used to be and the kernel
> is compiled with the exact same options for ide/dma and such. The
> changefile doesn't look like the via ide drivers were messed with. The only
> other difference is that all my drives are now ext3.
>
> Controller (motherboard) VP_IDE: VIA vt82c686a (rev 22) IDE UDMA66
> controller on pci00:07.1
> Controller (card) PDC20262: (U)DMA Burst Bit ENABLED Primary PCI Mode
> Secondary PCI Mode.
>
> All drives are set to UDMA4 (ATA66) hdparm isn't used, simple check shows
> that everything is set the way it should be default.
>
> Also, the kernel displays UDMA(66) wouldn't it be ATA66. UDMA comes in
> 1,2,4, and 5. that's like, ata16, ata33, ata66 and ata100.

Send me your /proc/ide/via and hdparm -i /dev/hd*, and I'll see if I see
any problems there ...

--
Vojtech Pavlik
SuSE Labs
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