From ff2ad3071f56697920a7154ca301fd45d17d57d2 Mon Sep 17 00:00:00 2001
From: Michal Schmidt <mschmidt@redhat.com>
Date: Tue, 25 Feb 2014 16:04:25 +0100
Subject: [PATCH] bnx2x: save RAM in kdump kernel by using a single queue
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 <mschmidt@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
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 34d124998823..26bc25bd465d 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;
}
--
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