On 8/26/21 5:49 PM, Bart Van Assche wrote: > On 8/26/21 11:45 AM, Jens Axboe wrote: >> Just ran a quick test here, and I go from 3.55M IOPS to 1.23M switching >> to deadline, of which 37% of the overhead is from dd_dispatch(). >> >> With the posted patch applied, it runs at 2.3M IOPS with mq-deadline, >> which is a lot better. This is on my 3970X test box, so 32 cores, 64 >> threads. > > Hi Jens, > > With the script below, queue depth >= 2 and an improved version of > Zhen's patch I see 970 K IOPS with the mq-deadline scheduler in an > 8 core VM (i7-4790 CPU). In other words, more IOPS than what Zhen > reported with fewer CPU cores. Is that good enough? That depends, what kind of IOPS are you getting if you revert the original change? -- Jens Axboe
