On Thu, Jan 5, 2017 at 4:23 PM, Andreas Gerstmayr
<andreas.gerstmayr@xxxxxxxxxxxx> wrote:
> This patch sets the io_pages bdi hint based on the rvsize mount option.
> Without this patch large buffered reads (request size > max readahead)
> are processed sequentially in chunks of the readahead size (i.e. read
> requests are sent out up to the readahead size, then the
> do_generic_file_read() function waits until the first page is received).
>
> With this patch read requests are sent out up to the size specified in
> the new rvsize mount option at once (default: 64 MB).
>
> Signed-off-by: Andreas Gerstmayr <andreas.gerstmayr@xxxxxxxxxxxx>
> ---
>
> Thanks for your review.
> On second thought, I think I should not reuse the rsize mount option
> (maximum read size per OSD request), therefore I created a new mount
> option rvsize with a default value of 64 MB (as you suggested).
>
> (Note: This patch depends on kernel version 4.10-rc1)
I'll defer to Zheng's judgement, but a separate mount option for this
seems overkill to me. We should be able to work something out between
the existing rsize and rasize.
Thanks,
Ilya
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