Messages in this thread | | | Subject | Re: [mm/page_alloc] f26b3fa046: netperf.Throughput_Mbps -18.0% regression | From | "" <> | Date | Wed, 11 May 2022 09:58:23 +0800 |
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On Tue, 2022-05-10 at 11:05 -0700, Linus Torvalds wrote: > [ Adding locking people in case they have any input ] > > On Mon, May 9, 2022 at 11:23 PM ying.huang@intel.com > <ying.huang@intel.com> wrote: > > > > > > > > Can you point me to the regression report? I would like to take a look, > > > thanks. > > > > https://lore.kernel.org/all/1425108604.10337.84.camel@linux.intel.com/ > > Hmm. > > That explanation looks believable, except that our qspinlocks > shouldn't be spinning on the lock itself, but spinning on the mcs node > it inserts into the lock.
The referenced regression report is very old (in Feb 2015 for 3.16- 3.17). The ticket spinlock was still used at that time. I believe that things become much better after we used qspinlock. We can test that.
Best Regards, Huang, Ying
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