DISK IO twice as slow.

From: Rogier Wolff (R.E.Wolff@BitWizard.nl)
Date: Fri May 12 2000 - 02:40:15 EST


Hi,

I was wondering why my disk-copy was taking so long, and decided to
downgrade to 2.2. to see if that made a difference. Well it did:

I'm getting 600k per second on 2.3.99pre7 and 1.2Mb per second on
2.2.15pre15.

The thing I'm doing is very similar to:

        dd if=/dev/hda of=somefile bs=1k

(Yes, I could use a larger blocksize if using dd, but in reality it is
a different application OK?)

I tried:
        hdparm -d1 /dev/hda

which on 2.3 gives "permission denied" (as root).
On 2.2, this was not neccesary, as it was already enabled.

                        Roger.

-- 
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 **
*-- BitWizard writes Linux device drivers for any device you may have! --*
*       Common sense is the collection of                                *
******  prejudices acquired by age eighteen.   -- Albert Einstein ********

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