* Linus Torvalds <[email protected]> wrote:
> On Fri, 2 Oct 2009, Jens Axboe wrote:
> >
> > It's really not that simple, if we go and do easy latency bits, then
> > throughput drops 30% or more.
>
> Well, if we're talking 500-950% improvement vs 30% deprovement, I
> think it's pretty clear, though. Even the server people do care about
> latencies.
>
> Often they care quite a bit, in fact.
The other thing is that latency is basically a given property in any
system - as an app writer you have to live with it, there's not much you
can do to improve it.
Bandwidth on the other hand is a lot more engineerable, as it tends to
be about batching things and you can batch in user-space too. Batching
is often easier to do than getting good latencies.
Then there's also the fact that the range of apps that care about
bandwidth is a lot smaller than the range of apps which care about
latencies. The default should help more apps - i.e. latencies.
Ingo
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