Messages in this thread | | | Subject | Re: Writeout in recent kernels/VMs poor compared to last -ac | Date | Sat, 12 Jan 2002 13:47:45 -0700 | From | Jeff Lessem <> |
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In your message of: Sat, 12 Jan 2002 10:17:39 EST, you write: >I recently began regularly transferring large (600 MB+) files to my >Linux-based fileserver and have noticed what I would characterize as poor >writeout behavior under this load. I've done a bit of comparison testing >which may help reveal the problem better.
I see the same behavior when writing to a USB attached harddisk/MP3 player, which also is formated VFAT. Doing a cp *.mp3 /usbdrive/ will read the mp3s into memory, until all free memory is filled, and then start writing them to the usb drive. Because it can only write at 800KB/s this behavior is very noticable. Once the few hundred MB of files in memory have been written out, the next batch of files will be read into memory, and then written out.
This behavior occurs under 2.4.17, and has occured under all recent 2.4 kernels. I haven't done any rigorous testing to see which, if any, -ac or early 2.4 kernels do not show this behavior.
If VFAT is considered an issue, I can reformat the disk ext2 for testing.
Not really any new information to add, just a "me too", though I would be happy to try out any proposed fixes.
-- Jeff Lessem. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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