From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Schmidt Subject: [PATCH net-next 2/3] bnx2x: save RAM in kdump kernel by using a single queue Date: Tue, 25 Feb 2014 16:04:25 +0100 Message-ID: <1393340666-3539-3-git-send-email-mschmidt@redhat.com> References: <1393340666-3539-1-git-send-email-mschmidt@redhat.com> Cc: netdev@vger.kernel.org, ariele@broadcom.com, dmitry@broadcom.com, yuvalmin@broadcom.com To: davem@davemloft.net Return-path: Received: from mx1.redhat.com ([209.132.183.28]:43141 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752923AbaBYPEi (ORCPT ); Tue, 25 Feb 2014 10:04:38 -0500 In-Reply-To: <1393340666-3539-1-git-send-email-mschmidt@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: When running in a kdump kernel, make sure to use only a single ethernet queue even if a num_queues option in /etc/modprobe.d/*.conf would specify otherwise. This saves memory, which tends to be scarce in kdump. This saves about 40 MB in the kdump environment on a setup with num_queues=8 in the config file. Signed-off-by: Michal Schmidt --- drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c index 64c17b6..500d38a 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c @@ -62,6 +62,11 @@ static void bnx2x_add_all_napi(struct bnx2x *bp) static int bnx2x_calc_num_queues(struct bnx2x *bp) { int nq = bnx2x_num_queues ? : netif_get_num_default_rss_queues(); + + /* Reduce memory usage in kdump environment by using only one queue */ + if (reset_devices) + nq = 1; + nq = clamp(nq, 1, BNX2X_MAX_QUEUES(bp)); return nq; } -- 1.8.5.3