Re: io_submit() taking a long time to return ?

[Raz Ben-Jehuda(caro)]

Zach !!!
what do u means by "sync block mapping " ?

thank u
raz


On 7/13/06, Zach Brown <zach.brown@xxxxxxxxxx> wrote:
> > By reading the aio documentation, we expected the io_submit call to
> > always return immediately,
>
> Sadly, that isn't guaranteed.
>
> > but in our preliminary tests we noticed that
> > sometimes this call can take a long time (more than 10 ms, even
> > sometimes more than 30 ms !!).
>
> If I had to guess I'd suspect that these delays are due to sync block
> mapping lookups in the submit path.  Do these tend to show up the first
> time you read a file?
>
> - z
>
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--
Raz
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