Re: Spinlocks, yet again: analysis and proposed patches

Gavin Sherry <swm@linuxworld.com.au> writes:
> What about padding the LWLock to 64 bytes on these architectures. Both P4
> and Opteron have 64 byte cache lines, IIRC. This would ensure that a
> cacheline doesn't hold two LWLocks.

I tried that first, actually, but it was a net loss.  I guess enlarging
the array that much wastes too much cache space.
        regards, tom lane