> -----Original Message----- > From: John Garry [mailto:john.garry@xxxxxxxxxx] > Sent: Tuesday, October 5, 2021 7:05 PM > To: Jens Axboe <axboe@xxxxxxxxx>; kashyap.desai@xxxxxxxxxxxx > Cc: linux-block@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > ming.lei@xxxxxxxxxx; hare@xxxxxxx; linux-scsi@xxxxxxxxxxxxxxx > Subject: Re: [PATCH v5 00/14] blk-mq: Reduce static requests memory > footprint for shared sbitmap > > On 05/10/2021 13:35, Jens Axboe wrote: > >> Baseline is 1b2d1439fc25 (block/for-next) Merge branch > >> 'for-5.16/io_uring' > >> into for-next > > Let's get this queued up for testing, thanks John. > > Cheers, appreciated > > @Kashyap, You mentioned that when testing you saw a performance > regression from v5.11 -> v5.12 - any idea on that yet? Can you describe > the > scenario, like IO scheduler and how many disks and the type? Does > disabling > host_tagset_enable restore performance? John - I am still working on this. System was not available due to some other debugging. > > From checking differences between those kernels, I don't see anything > directly relevant in sbitmap support or in the megaraid sas driver. > > Thanks, > John
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