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Re: [dm-devel] [Lsf-pc] [LSF/MM TOPIC] a few storage topics




Cheers, Andreas

On 2012-01-24, at 9:56, Christoph Hellwig <hch infradead org> wrote:

> On Tue, Jan 24, 2012 at 10:15:04AM -0500, Chris Mason wrote:
>> https://lkml.org/lkml/2011/12/13/326
>> 
>> This patch is another example, although for a slight different reason.
>> I really have no idea yet what the right answer is in a generic sense,
>> but you don't need a 512K request to see higher latencies from merging.
> 
> That assumes the 512k requests is created by merging.  We have enough
> workloads that create large I/O from the get go, and not splitting them
> and eventually merging them again would be a big win.  E.g. I'm
> currently looking at a distributed block device which uses internal 4MB
> chunks, and increasing the maximum request size to that dramatically
> increases the read performance.
> 
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