[PATCH net-next] net: Reduce queue allocation to one in kdump kernel
From: Hariprasad Shenai <hidden>
Date: 2016-06-08 12:33:57
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
When in kdump kernel, reduce memory usage by only using a single Queue Set for multiqueue devices. So make netif_get_num_default_rss_queues() return one, when in kdump kernel. Signed-off-by: Hariprasad Shenai <redacted> --- net/core/dev.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 904ff431d570..161c4627a798 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c@@ -139,6 +139,7 @@ #include <linux/hrtimer.h> #include <linux/netfilter_ingress.h> #include <linux/sctp.h> +#include <linux/crash_dump.h> #include "net-sysfs.h"
@@ -2249,7 +2250,8 @@ EXPORT_SYMBOL(netif_set_real_num_rx_queues); */ int netif_get_num_default_rss_queues(void) { - return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); + return is_kdump_kernel() ? + 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus()); } EXPORT_SYMBOL(netif_get_num_default_rss_queues);
--
2.3.4