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SubjectRe: IDE0 /dev/hda performance hit in 2217 on my HW
check if DMA mode is still on, on your hard drive.  I'm trying to remember if
that behaviour changed for 2.2.17

LA Walsh wrote:

> I skimmed over the archives and didn't find a mention of this. I thought
> I'd noticed this when I first installed 2217, but I was too busy to verify
> it at the time.
>
> Simple case:
> Under 2216, I can do a 'badblocks /dev/hda1 XXXXX'. Vmstat shows about
> 10,000K/s average. This is consistent with 'dd' operations I use to copy
> partitions for disk mirroring/backup.
>
> Under 2217, the xfer speed drops to near 1,000K/s. This is for both
> 'badblocks'
> and a 'dd' if=/dev/hda of=/dev/hdb bs=256k. In both instances, I notice
> a near 90% performance degredation.
>
> Haven't tried any latest 2.2.18's -- has there been any work that might
> have fixed this problem in 2218. Am I the only person who noticed this?
> I.e. -- maybe it's something peculiar to my HW (Inspiron 7500),
> IBM DARA-22.5G HD.
>
> --
> L A Walsh | Trust Technology, Core Linux, SGI
> law@sgi.com | Voice/Vmail: (650) 933-5338
>
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