From patchwork Wed Jun 8 12:39:08 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hariprasad Shenai X-Patchwork-Id: 632204 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3rPntK01yQz9t3h for ; Wed, 8 Jun 2016 22:34:01 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422641AbcFHMd6 (ORCPT ); Wed, 8 Jun 2016 08:33:58 -0400 Received: from [12.32.117.8] ([12.32.117.8]:31904 "EHLO stargate3.asicdesigners.com" rhost-flags-FAIL-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1161246AbcFHMd5 (ORCPT ); Wed, 8 Jun 2016 08:33:57 -0400 Received: from gill.asicdesigners.com.com ([10.193.186.211]) by stargate3.asicdesigners.com (8.13.8/8.13.8) with ESMTP id u58CXrd1007295; Wed, 8 Jun 2016 05:33:53 -0700 From: Hariprasad Shenai To: davem@davemloft.net Cc: netdev@vger.kernel.org, nirranjan@chelsio.com, Hariprasad Shenai Subject: [PATCH net-next] net: Reduce queue allocation to one in kdump kernel Date: Wed, 8 Jun 2016 18:09:08 +0530 Message-Id: <1465389548-7651-1-git-send-email-hariprasad@chelsio.com> X-Mailer: git-send-email 2.3.4 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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 --- 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 #include #include +#include #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);