Messages in this thread | | | Date | Thu, 10 Oct 2013 18:25:35 +0200 | From | Karl Kiniger <> | Subject | per block device cache use adjustable? |
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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.
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