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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.002282, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/25/2025 1:30 PM, Raghavendra K T wrote: > On 3/19/2025 1:44 PM, Nikhil Dhama wrote: > [...] >>> And, do you run network related workloads on one machine?  If so, >>> please >>> try to run them on two machines instead, with clients and servers >>> run on >>> different machines.  At least, please use different sockets for clients >>> and servers.  Because larger pcp->free_count will make it easier to >>> trigger free_high heuristics.  If that is the case, please try to >>> optimize free_high heuristics directly too. >> >> I agree with Ying Huang, the above change is not the best possible >> fix for >> the issue. On futher analysis I figured that root cause of the issue is >> the frequent pcp high order flushes. During a 20sec iperf3 run >> I observed on avg 5 pcp high order flushes in kernel v6.6, whereas, in >> v6.7, I observed about 170 pcp high order flushes. >> Tracing pcp->free_count, I figured with the patch v1 (patch I suggested >> earlier) free_count is going into negatives which reduces the number of >> times free_high heuristics is triggered hence reducing the high order >> flushes. >> >> As Ying Huang Suggested, it helps the performance on increasing the >> batch size >> for free_high heuristics. I tried different scaling factors to find best >> suitable batch value for free_high heuristics, >> >> >>             score    # free_high >> -----------        -----    ----------- >> v6.6 (base)        100         4 >> v6.12 (batch*1)         69          170 >> batch*2             69          150 >> batch*4             74          101 >> batch*5            100           53 >> batch*6            100           36 >> batch*8            100        3 >>    scaling batch for free_high heuristics with a factor of 5 restores >> the >> performance. > > Hello Nikhil, > > Thanks for looking further on this. But from design standpoint, > how a batch-size of 5 is helping here is not clear (Andrew's original > question). > > Any case can you post the patch-set in a new email so that the below > patch is not lost in discussion thread? Hi Raghavendra, Thanks, I have posted the patch-set in a new email link: https://lore.kernel.org/linux-mm/20250325171915.14384-1-nikhil.dhama@amd.com/ with a better explanation on  how scaling batch is helping here. Thanks, Nikhil