Re: [PATCH 0/3] implement readpages() for block device to optimize sequential read

[Akinobu Mita]

2014-08-15 7:04 GMT+09:00 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>:
> On Tue,  5 Aug 2014 23:38:31 +0900 Akinobu Mita <akinobu.mita@xxxxxxxxx> wrote:
>
>> This patchset implements readpages() operation for block device by
>> using mpage_readpages() which can create multipage BIOs instead of
>> BIOs for each page and reduce system CPU time consumption.
>
> Patchset is simple and straightforward enough.  But who the
> heck cares about the performance of buffered reads from /dev/XXX?

I tend to consider the block device as a baseline when I measure the
performance of the storage device.  So I was a bit surprised when I saw
the performance of buffered reads from filesystem is better than the one
from block device.  That is the reason about this patch for me.
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