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Re: [Qemu-devel] [RFC PATCH] qht: Align sequence lock to cache line


From: Emilio G. Cota
Subject: Re: [Qemu-devel] [RFC PATCH] qht: Align sequence lock to cache line
Date: Tue, 25 Oct 2016 16:45:15 -0400
User-agent: Mutt/1.5.24 (2015-08-30)

On Tue, Oct 25, 2016 at 16:35:48 -0400, Pranith Kumar wrote:
> On Tue, Oct 25, 2016 at 4:02 PM, Paolo Bonzini <address@hidden> wrote:
> >
> >
> >> I've written a patch (see below) to take the per-bucket sequence locks.
> >
> > What's the performance like?
> >
> 
> Applying only this patch, the perf numbers are similar to the 128
> cache line alignment you suggested.

That makes sense. Having a single seqlock per bucket is simple and fast;
note that bucket chains should be very short (we use good hashing and
automatic resize for this purpose).

                E.



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