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authorEric Dumazet <edumazet@google.com>2013-08-08 14:38:47 -0700
committerDavid S. Miller <davem@davemloft.net>2013-08-10 01:16:44 -0700
commit28d6427109d13b0f447cba5761f88d3548e83605 (patch)
tree5f463fa756d508625e8cea1da31406e66a0b263e /net/packet
parente370a7236321773245c5522d8bb299380830d3b2 (diff)
downloadblackbird-obmc-linux-28d6427109d13b0f447cba5761f88d3548e83605.tar.gz
blackbird-obmc-linux-28d6427109d13b0f447cba5761f88d3548e83605.zip
net: attempt high order allocations in sock_alloc_send_pskb()
Adding paged frags skbs to af_unix sockets introduced a performance regression on large sends because of additional page allocations, even if each skb could carry at least 100% more payload than before. We can instruct sock_alloc_send_pskb() to attempt high order allocations. Most of the time, it does a single page allocation instead of 8. I added an additional parameter to sock_alloc_send_pskb() to let other users to opt-in for this new feature on followup patches. Tested: Before patch : $ netperf -t STREAM_STREAM STREAM STREAM TEST Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 2304 212992 212992 10.00 46861.15 After patch : $ netperf -t STREAM_STREAM STREAM STREAM TEST Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 2304 212992 212992 10.00 57981.11 Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 4cb28a7f639b..6c53dd9f5ccc 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2181,7 +2181,7 @@ static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
linear = len;
skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
- err);
+ err, 0);
if (!skb)
return NULL;
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