Re: data loss in 2.6.9-rc1-mm1

[Andrew Morton]

Ram Pai <linuxram@xxxxxxxxxx> wrote:
>
> > OK - maybe that can go for a spin in the next -mm. Andrew did you
> > get it?
> 
> So in case my vote counts, add my vote too :)  .
> 

Can someone send me the patch?

> 
> But the biggest performance boost has been seen with large max-readahead
> window sizes. Currently most of the underlying block devices default to
> 32 pages max-readahead  even though the underlying device can handle
> much larger reads. We could extract much more sequential read
> performance if the max-readahead was set to much higher values like 256
> pages which most modern devices are capable off. The problem AFAICT is
> that the block device layer defaults the max-readahead value for most
> block devices to 32, without consulting the capability of the underlying
> block device driver. 

This can be done in startup scripts.
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