[patch 031/101] Avoid using nfsd process pools on SMP machines.

[Greg KH]

From: NeilBrown <neilb@xxxxxxx>


process-pools have real benefits for NUMA, but on SMP
machines they only work if network interface interrupts
go to all CPUs (via round-robin or multiple nics).  This is
not always the case, so disable the pools in this case until
a better solution is developped.

Signed-off-by: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

diff .prev/net/sunrpc/svc.c ./net/sunrpc/svc.c
---
 net/sunrpc/svc.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- linux-2.6.20.1.orig/net/sunrpc/svc.c
+++ linux-2.6.20.1/net/sunrpc/svc.c
@@ -79,7 +79,11 @@ svc_pool_map_choose_mode(void)
 		 * x86_64 kernel on Xeons.  In this case we
 		 * want to divide the pools on cpu boundaries.
 		 */
-		return SVC_POOL_PERCPU;
+		/* actually, unless your IRQs round-robin nicely,
+		 * this turns out to be really bad, so just
+		 * go GLOBAL for now until a better fix can be developped
+		 */
+		return SVC_POOL_GLOBAL;
 	}
 
 	/* default: one global pool */

--
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