Re: Remove Instruction Synchronization Barrier in spin_delay() for ARM64 architecture - Mailing list pgsql-hackers

From Nathan Bossart
Subject Re: Remove Instruction Synchronization Barrier in spin_delay() for ARM64 architecture
Date
Msg-id aCurmWfKUjQl6ozO@nathan
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In response to Re: Remove Instruction Synchronization Barrier in spin_delay() for ARM64 architecture  (Nathan Bossart <nathandbossart@gmail.com>)
List 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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