[3.16.y-ckt stable] Patch "xen-netback: respect user provided max_queues" has been added to the 3.16.y-ckt tree
Luis Henriques
luis.henriques at canonical.com
Wed Feb 3 13:57:15 UTC 2016
This is a note to let you know that I have just added a patch titled
xen-netback: respect user provided max_queues
to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue
This patch is scheduled to be released in version 3.16.7-ckt24.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
---8<------------------------------------------------------------
>From 2ce7c9bd5b91ee8d4b8bb1e7a3a066034744c8b8 Mon Sep 17 00:00:00 2001
From: Wei Liu <wei.liu2 at citrix.com>
Date: Thu, 10 Sep 2015 11:18:57 +0100
Subject: xen-netback: respect user provided max_queues
commit 4c82ac3c37363e8c4ded6a5fe1ec5fa756b34df3 upstream.
Originally that parameter was always reset to num_online_cpus during
module initialisation, which renders it useless.
The fix is to only set max_queues to num_online_cpus when user has not
provided a value.
Reported-by: Johnny Strom <johnny.strom at linuxsolutions.fi>
Signed-off-by: Wei Liu <wei.liu2 at citrix.com>
Reviewed-by: David Vrabel <david.vrabel at citrix.com>
Acked-by: Ian Campbell <ian.campbell at citrix.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
drivers/net/xen-netback/netback.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 0c1574212162..4a35be8e397c 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -2008,8 +2008,11 @@ static int __init netback_init(void)
if (!xen_domain())
return -ENODEV;
- /* Allow as many queues as there are CPUs, by default */
- xenvif_max_queues = num_online_cpus();
+ /* Allow as many queues as there are CPUs if user has not
+ * specified a value.
+ */
+ if (xenvif_max_queues == 0)
+ xenvif_max_queues = num_online_cpus();
if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) {
pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n",
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