Thank you for investigating and resolving this issue. Your effort is
very much appreciated.
I am interested in when this patch will end up in a release. Is it going
to make it into a 5.17.x release or will it not come until 5.18?
--Larkin
On 3/11/2022 11:59 AM, Song Liu wrote:
Hi Jens,
On Fri, Mar 11, 2022 at 6:16 AM Jens Axboe <axboe@xxxxxxxxx> wrote:
On 3/10/22 5:07 PM, Jens Axboe wrote:
In any case, just doing larger reads would likely help quite a bit, but
would still be nice to get to the bottom of why we're not seeing the
level of merging we expect.
Song, can you try this one? It'll do the dispatch in a somewhat saner
fashion, bundling identical queues. And we'll keep iterating the plug
list for a merge if we have multiple disks, until we've seen a queue
match and checked.
This one works great! We are seeing 99% read request merge and
500kB+ average read size. The original patch in this thread only got
88% and 34kB for these two metrics.
Thanks,
Song
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