Re: IDE0 /dev/hda performance hit in 2217 on my HW

[Mike Dresser <mdresser@windsormachine.com>]

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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