Messages in this thread | | | Date | Thu, 9 Oct 2003 16:11:43 +0200 | From | Jens Axboe <> | Subject | Re: [PATCH] laptop mode |
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On Thu, Oct 09 2003, Marcelo Tosatti wrote: > > > On Thu, 9 Oct 2003, Jeff Garzik wrote: > > > Linux Kernel Mailing List wrote: > > > ChangeSet 1.1150.1.52, 2003/10/08 10:49:45-03:00, axboe@suse.de > > > > > > [PATCH] laptop mode > > > > > > Hi Marcelo, > > > > > > Lots of people have been using this patch with great success, and it's > > > been in the SuSE kernel for some months now too. It is also in the -benh > > > ppc tree > > > > > > Basically, it introduces a write back mode of dirty and journal data > > > that is more suitable for laptops. At the block layer end, it schedules > > > write out of dirty data after the disk has been idle for 5 seconds. > > > > > > Laptop mode can be switched on and off with /proc/sys/vm/laptop_mode. > > > There is also a block_dump sysctl, which if enabled will dump who > > > dirties and writes out data. This is very helpful in pinning down who is > > > causing unnecessary writes to the disk. > > > > Red Hat just dropped this patch since it was suspected of data > > corruption ;-( > > Uh, oh... Jens?
See my previous mail. I don't see any problems with it, and I've certainly not heard of (or experienced myself) problems with the patch. I'm waiting for Jeff to expand on his mail, surely he/RH must know more about this issue.
-- Jens Axboe
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