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SubjectRe: [patch] `cp /dev/zero /tmp' (patch against 2.2.9)
On Wed, 16 Jun 1999, Stephen C. Tweedie wrote:

>Unfortunately it does completely the wrong thing if you have more than
>one disk: it stalls all writes on all disks as soon as any one disk goes
>into wait-on-read. That's not good. Not good at all.

I agree that it's _ugly_, but it's equally ugly that we currently may
block due out of request slots, without being able to start I/O on the
second blockdevice.

Said that, did you verifyied that you really lost performances under high
I/O load using two block devices? (as just said I agree with you about the
theory)

Andrea Arcangeli


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