Re: ext2/3 performance regression in 2.6 vs 2.4 for small interleaved writes

[Andrea Arcangeli]

On Wed, Feb 11, 2004 at 06:00:19PM -0800, Dave Olien wrote:
> 
> 2.4 does not have deadline scheduler.  But the 2.6 deadline scheduler
> is more similar to 2.4's scheduler than is the anticipatory scheduler.

the main difference is that 2.4 isn't in function of time, it's in
function of requests, no matter how long it takes to write a request, so
it's potentially optimizing slow devices when you don't care about
latency (deadline can be tuned for each dev via
/sys/block/*/queue/iosched/).
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