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SubjectRe: [PATCH] sunrpc: use better NUMA affinities
On Fri, Jul 29, 2011 at 08:02:05PM +0200, Eric Dumazet wrote:
> Le vendredi 29 juillet 2011 à 12:42 -0400, J. Bruce Fields a écrit :
> > On Thu, Jul 28, 2011 at 08:04:09PM +0200, Eric Dumazet wrote:
> > > Use NUMA aware allocations to reduce latencies and increase throughput.
> > >
> > > sunrpc kthreads can use kthread_create_on_node() if pool_mode is
> > > "percpu" or "pernode", and svc_prepare_thread()/svc_init_buffer() can
> > > also take into account NUMA node affinity for memory allocations.
> > ...
> > > @@ -662,14 +675,16 @@ svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
> > > nrservs--;
> > > chosen_pool = choose_pool(serv, pool, &state);
> > >
> > > - rqstp = svc_prepare_thread(serv, chosen_pool);
> > > + node = svc_pool_map_get_node(chosen_pool->sp_id);
> > > + rqstp = svc_prepare_thread(serv, chosen_pool, node);
> >
> > The only correct value for the third argument there is
> > svc_pool_map_get_node(chosen_pool->sp_id), so let's have
> > svc_prepare_thread() call that itself.
> >
>
> I have no idea of what you mean ;)
>
> I need 'node' for the following kthread_create_on_node()

Doh, of course--apologies.

> > Seems OK otherwise.
> >
> > Any suggestions on how we should test this?
>
> I did tests on my machine, seems good.
>
> I checked that stacks were now correct using :
> "echo t > /proc/sysrq-trigger"

I was wondering more about good tests of nfsd's performance on numa;
that might be more of a question for Greg.

--b.
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