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Re: oflag=direct speed boost
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From: |
Paul Eggert |
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Subject: |
Re: oflag=direct speed boost |
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Date: |
Thu, 01 Dec 2005 09:48:22 -0800 |
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User-agent: |
Gnus/5.1007 (Gnus v5.10.7) Emacs/21.4 (gnu/linux) |
Dominik Smogór <address@hidden> writes:
> What is the problem with my system. Is my system badly misconfigured?
Could be. I don't observe similar behavior on my system
(Debian stable, Linux kernel 2.4.27-2-686).
# dd if=/dev/hda of=/dev/null bs=1M count=100 skip=600 iflag=direct
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 3.16582 seconds, 33.1 MB/s
# dd if=/dev/hda of=/dev/null bs=1M count=100 skip=1200
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 2.9907 seconds, 35.1 MB/s
Sometimes it runs faster with direct, sometimes not.