Badari Pulavarty <pbadari@us.ibm.com> wrote:
>
> We should do readahead of actual pages required by the current
> read would be correct solution. (like Suparna suggested).
I repeat: what will be the effect of this if all those pages are already in
pagecache?
> When readahead window is closed, slow read code will be submitting IO in 4k
> chunks. Infact, it will wait for the IO to finish, before reading next page.
> Isn't it?
Yes.
> How would you ensure atleast 16k worth of pages are submitted
> in a sinle chunk here ?
Need to work out why the window got itself shrunk, fix that, then constrain each
readahead chunk to the size of the application's read() if the application
just seeked, I think.
> I am hoping that forcing readhead code to read pages needed by current read
> would address this problem.
You'll have Martin and Anton coming after you with SDET regressions.
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This archive was generated by hypermail 2b29 : Thu Aug 07 2003 - 22:00:39 EST