| From: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
|---|---|
| To: | Salvatore Dipietro <dipietro(dot)salvatore(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org, Salvatore Dipietro <dipiets(at)amazon(dot)com>, blakgeof(at)amazon(dot)com |
| Subject: | Re: Remove Instruction Synchronization Barrier in spin_delay() for ARM64 architecture |
| Date: | 2025-05-19 22:07:21 |
| Message-ID: | aCurmWfKUjQl6ozO@nathan |
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| Lists: | pgsql-hackers |
On Mon, May 19, 2025 at 11:38:39AM -0500, Nathan Bossart wrote:
> On Tue, May 13, 2025 at 11:37:45AM -0700, Salvatore Dipietro wrote:
>> Based on your findings Nathan, what is the best way to proceed for this change?
>> Do we need more validation for it? If yes, which kind?
>
> Well, I am confused because your recent message [0] indicated that you saw
> improvement without the non-locking initial test in TAS_SPIN, which seems
> to contradict my findings [1]. Could you retry your tests on v18devel? It
> might also be useful to repeat the tests on a variety of hardware to ensure
> it's a win across the board.
I should probably also mention that we are in feature-freeze until v19
development opens in July.
--
nathan
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