From: Eric Dumazet <eric.dumazet@gmail.com>
To: "Ilpo Järvinen" <ilpo.jarvinen@helsinki.fi>
Cc: David Miller <davem@davemloft.net>,
rick.jones2@hp.com, Netdev <netdev@vger.kernel.org>,
therbert@google.com, ncardwell@google.com, maze@google.com,
Yuchung Cheng <ycheng@google.com>
Subject: Re: [PATCH 2/2 net-next] tcp: sk_add_backlog() is too agressive for TCP
Date: Tue, 24 Apr 2012 10:56:43 +0200 [thread overview]
Message-ID: <1335257803.5205.133.camel@edumazet-glaptop> (raw)
In-Reply-To: <alpine.DEB.2.00.1204241131580.735@wel-95.cs.helsinki.fi>
On Tue, 2012-04-24 at 11:40 +0300, Ilpo Järvinen wrote:
> diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
> index 8bb6ade..33b87b2 100644
> --- a/net/ipv4/tcp.c
> +++ b/net/ipv4/tcp.c
> @@ -2820,7 +2820,11 @@ found:
> flush |= (__force int)(flags & TCP_FLAG_CWR);
> flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
> ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
> - flush |= (__force int)(th->ack_seq ^ th2->ack_seq);
> +
> + ackgap = skb_shinfo(p)->ack_size;
> + ackdiff = th2->ack_seq - th->ack_seq;
> + flush |= (ackdiff - 1) >= ackgap;
> +
> for (i = sizeof(*th); i < thlen; i += 4)
> flush |= *(u32 *)((u8 *)th + i) ^
> *(u32 *)((u8 *)th2 + i);
>
See how we duplicate tcp stack in GRO layer ;)
Really I have many doubts about GRO today.
next prev parent reply other threads:[~2012-04-24 8:56 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-23 9:38 [PATCH 2/2 net-next] tcp: sk_add_backlog() is too agressive for TCP Eric Dumazet
2012-04-23 17:14 ` Rick Jones
2012-04-23 17:23 ` Eric Dumazet
2012-04-23 20:01 ` David Miller
2012-04-23 20:37 ` Eric Dumazet
2012-04-23 20:57 ` Rick Jones
2012-04-23 21:30 ` Eric Dumazet
2012-04-23 21:51 ` Rick Jones
2012-04-23 21:56 ` Rick Jones
2012-04-23 22:05 ` Eric Dumazet
2012-04-23 22:16 ` Rick Jones
2012-04-24 15:25 ` Christoph Lameter
2012-04-23 21:01 ` David Miller
2012-04-23 21:38 ` Eric Dumazet
2012-04-24 2:20 ` Eric Dumazet
2012-04-24 2:27 ` David Miller
2012-04-24 8:01 ` Ilpo Järvinen
2012-04-24 8:10 ` David Miller
2012-04-24 8:21 ` Ilpo Järvinen
2012-04-24 8:25 ` David Miller
2012-04-24 8:40 ` Ilpo Järvinen
2012-04-24 8:48 ` David Miller
2012-04-24 10:32 ` Ilpo Järvinen
2012-04-24 8:56 ` Eric Dumazet [this message]
2012-04-26 8:10 ` [RFC] allow skb->head to point/alias to first skb frag Eric Dumazet
2012-04-26 8:36 ` David Miller
2012-04-26 9:10 ` Eric Dumazet
2012-04-26 9:18 ` David Miller
2012-04-26 9:22 ` Eric Dumazet
2012-04-26 10:09 ` Maciej Żenczykowski
2012-04-26 12:32 ` Eric Dumazet
2012-04-26 13:50 ` Eric Dumazet
2012-04-26 20:12 ` David Miller
2012-04-26 20:18 ` Eric Dumazet
2012-04-24 8:49 ` [PATCH 2/2 net-next] tcp: sk_add_backlog() is too agressive for TCP Eric Dumazet
2012-04-24 8:44 ` David Laight
2012-04-24 8:53 ` Eric Dumazet
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