> The only reason the x86 ticket locks have the 256 CPu limit is that
> if they go any bigger, we can't use the partial registers so would
> have to have a few more instructions.
x86_64 is going up to 4k or 16k cpus soon for our new hardware.
> A 32 bit spinlock would allow 64K cpus (ticket lock has 2 counters,
> each would be 16 bits). And it would actually shrink the spinlock in
> the case of preempt kernels too (because it would no longer have the
> lockbreak field).
>
> And yes, I'll go out on a limb and say that 64k CPUs ought to be
> enough for anyone ;)
I think those things need a timeframe applied to it. Thats likely
going to be true for the next 3 years (optimistic assessment ;-)).
Could you go to 32bit spinlock by default?
How about NUMA awareness for the spinlocks? Larger backoff periods for
off node lock contentions please.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
