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| author | Eric Dumazet <edumazet@google.com> | 2013-04-12 11:31:52 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-12 18:17:06 -0400 |
| commit | d6a4a10411764cf1c3a5dad4f06c5ebe5194488b (patch) | |
| tree | 54d1e4c0c92bc780d9e2f8a822c1c8dc271df70d /include/net/tcp.h | |
| parent | d14a489a411937fb9420fe2b05168ee9e1e06c9c (diff) | |
| download | kernel-common-d6a4a10411764cf1c3a5dad4f06c5ebe5194488b.tar.gz kernel-common-d6a4a10411764cf1c3a5dad4f06c5ebe5194488b.tar.bz2 kernel-common-d6a4a10411764cf1c3a5dad4f06c5ebe5194488b.zip | |
tcp: GSO should be TSQ friendly
I noticed that TSQ (TCP Small queues) was less effective when TSO is
turned off, and GSO is on. If BQL is not enabled, TSQ has then no
effect.
It turns out the GSO engine frees the original gso_skb at the time the
fragments are generated and queued to the NIC.
We should instead call the tcp_wfree() destructor for the last fragment,
to keep the flow control as intended in TSQ. This effectively limits
the number of queued packets on qdisc + NIC layers.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tom Herbert <therbert@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Nandita Dukkipati <nanditad@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 4475aaf0af57..5bba80fbd1d9 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -370,6 +370,7 @@ extern int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, extern int tcp_sendpage(struct sock *sk, struct page *page, int offset, size_t size, int flags); extern void tcp_release_cb(struct sock *sk); +extern void tcp_wfree(struct sk_buff *skb); extern void tcp_write_timer_handler(struct sock *sk); extern void tcp_delack_timer_handler(struct sock *sk); extern int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg); |