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SubjectRe: IDE performance problems on 2.6.0-pre1


On Tue, 16 Jul 2003, Felipe Alfaro Solana wrote:

> On Tue, 2003-07-15 at 23:49, derek@signalmarketing.com wrote:
> > Hello,
> >
> > My ide performance seems to have dropped noticably from 2.4.x to
> > 2.6.0-pre1...
>
> What does "hdparm /dev/hde" tell us?

hdparm /dev/hde from 2.6.0-pre1

/dev/hde:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 50765/16/63, sectors = 117231408, start = 0

---
hdparm /dev/hde from 2.4

/dev/hde:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 116301/16/63, sectors = 117231408, start = 0


I hadn't noticed the change in readahead previously, so I tried setting it
to 8 in 2.6.0-pre1 with hdparm -a 8 /dev/hde

hdparm -t /dev/hde

/dev/hde:
Timing buffered disk reads: 32 MB in 3.01 seconds = 10.64 MB/sec

hdparm -a 512 on the other hand...

Timing buffered disk reads: 140 MB in 3.03 seconds = 46.18 MB/sec

and I get my previous numbers back.

I guess the meaning of the parameter has changed dramatically? (what was
once sectors is now bytes?)
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