RE: cfq performance gap

[Chen, Kenneth W]

Miquel van Smoorenburg wrote on Wednesday, December 13, 2006 1:57 AM
> Chen, Kenneth W <kenneth.w.chen@xxxxxxxxx> wrote:
> >This rawio test plows through sequential I/O and modulo each small record
> >over number of threads.  So each thread appears to be non-contiguous within
> >its own process context, overall request hitting the device are sequential.
> >I can't see how any application does that kind of I/O pattern.
> 
> A NNTP server that has many incoming connections, handled by
> multiple threads, that stores the data in cylic buffers ?

Then whichever the thread that dumps the buffer content to the storage
will do one large contiguous I/O.
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