Re: BufferAlloc: don't take two simultaneous locks

В Вт, 15/03/2022 в 13:47 +0300, Yura Sokolov пишет:
> В Вт, 15/03/2022 в 16:25 +0900, Kyotaro Horiguchi пишет:
> > > I lost access to Xeon 8354H, so returned to old Xeon X5675.
> > ...
> > > Strange thing: both master and patched version has higher
> > > peak tps at X5676 at medium connections (17 or 27 clients)
> > > than in first october version [1]. But lower tps at higher
> > > connections number (>= 191 clients).
> > > I'll try to bisect on master this unfortunate change.
> > 
> > The reversing of the preference order between freshly-allocation and
> > borrow-from-another-freelist might affect.
> 
> `master` changed its behaviour as well.
> It is not problem of the patch at all.

Looks like there is no issue: old commmit 2d44dee0281a1abf
behaves similar to new one at the moment.

I think, something changed in environment.
I remember there were maintanance downtime in the autumn.
Perhaps kernel were updated or some sysctl tuning changed.

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regards
Yura.