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authorEric Dumazet <edumazet@google.com>2012-10-06 08:08:49 +0000
committerDavid S. Miller <davem@davemloft.net>2012-10-08 14:51:51 -0400
commit2e71a6f8084e7ac87166dd77d99c44190fb844fc (patch)
treeeb2e2d47361b35b2b5a3f26beac3d1fbd888c372 /drivers/net/ethernet/realtek/8139cp.c
parenta2af139ff1cd85df586690ff626619ab1ee88b0a (diff)
downloadvexpress-lsk-2e71a6f8084e7ac87166dd77d99c44190fb844fc.tar.gz
net: gro: selective flush of packets
Current GRO can hold packets in gro_list for almost unlimited time, in case napi->poll() handler consumes its budget over and over. In this case, napi_complete()/napi_gro_flush() are not called. Another problem is that gro_list is flushed in non friendly way : We scan the list and complete packets in the reverse order. (youngest packets first, oldest packets last) This defeats priorities that sender could have cooked. Since GRO currently only store TCP packets, we dont really notice the bug because of retransmits, but this behavior can add unexpected latencies, particularly on mice flows clamped by elephant flows. This patch makes sure no packet can stay more than 1 ms in queue, and only in stress situations. It also complete packets in the right order to minimize latencies. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Jesse Gross <jesse@nicira.com> Cc: Tom Herbert <therbert@google.com> Cc: Yuchung Cheng <ycheng@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/realtek/8139cp.c')
-rw-r--r--drivers/net/ethernet/realtek/8139cp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index 995d0cfc4c0..1c818254b7b 100644
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -563,7 +563,7 @@ rx_next:
if (cpr16(IntrStatus) & cp_rx_intr_mask)
goto rx_status_loop;
- napi_gro_flush(napi);
+ napi_gro_flush(napi, false);
spin_lock_irqsave(&cp->lock, flags);
__napi_complete(napi);
cpw16_f(IntrMask, cp_intr_mask);