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bnx2x: save RAM in kdump kernel by using a single queue

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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>
This commit is contained in:
Michal Schmidt 2014-02-25 16:04:25 +01:00 • committed by David S. Miller
parent 7d0445d66a
commit ff2ad3071f
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
View file

@ -62,6 +62,11 @@ static void bnx2x_add_all_napi(struct bnx2x *bp)
static int bnx2x_calc_num_queues(struct bnx2x *bp) static int bnx2x_calc_num_queues(struct bnx2x *bp)
{ {
int nq = bnx2x_num_queues ? : netif_get_num_default_rss_queues(); 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)); nq = clamp(nq, 1, BNX2X_MAX_QUEUES(bp));
return nq; return nq;
} }