Re: [PATCH] laptop mode

[Jeff Garzik]

Jens Axboe wrote:
> 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@xxxxxxx
> > > >
> > > > 	[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.


That's 100% of my knowledge.  Talk to arjan/davej/sct for more info...

That's what RH's field testing showed us, ignore it if you wish... :)

	Jeff



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