From: Karl Kiniger <karl.kiniger@med.ge.com>
To: linux-kernel@vger.kernel.org
Subject: per block device cache use adjustable?
Date: Thu, 10 Oct 2013 18:25:35 +0200 [thread overview]
Message-ID: <20131010162535.GA12986@kipc2.localdomain> (raw)
Using a 4.7 GB 4x DVD+RW I did:
(Fedora 19, x86_64, 4GB RAM)
mkudffs /dev/sr0
mount /dev/sr0 /dvd0
dd if=some-4gb-file of=/dvd0/bigfile.bin
After a few seconds ls -l /dvd0/bigfile.bin displayed 600 MB which
means that more than 30 seconds are kept in RAM.
Is it possible to limit the write cache to a sane value
for this specific device? (perhaps a few seconds at 2..3 MB/sec
write speed)
Thanks in advance for anything helpful,
Karl
PS: dd oflag=direct helps of course but I would like to have
a tuning knob to play with to get optimal performance in my
situation.
reply other threads:[~2013-10-10 16:31 UTC|newest]
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