From: David Miller <davem@davemloft.net>
To: greearb@candelatech.com
Cc: netdev@vger.kernel.org
Subject: Re: [net-next 1/2] qdisc: Allow qdiscs to provide backpressure up the stack.
Date: Thu, 26 Aug 2010 22:36:04 -0700 (PDT) [thread overview]
Message-ID: <20100826.223604.48516081.davem@davemloft.net> (raw)
In-Reply-To: <4C774B8F.2030805@candelatech.com>
From: Ben Greear <greearb@candelatech.com>
Date: Thu, 26 Aug 2010 22:22:23 -0700
> On 08/26/2010 09:34 PM, David Miller wrote:
>> From: Ben Greear<greearb@candelatech.com>
>> Date: Thu, 26 Aug 2010 21:14:39 -0700
>>
>>> I'll look into the NET_XMIT_CN, but if that propagates backpressure up
>>> through mac-vlan, then something must know how to re-start the tx
>>> logic.
>>
>> It doesn't need to, as it drops and frees up the packet.
>
> If there were 5 pkts in the socket buffer, and the attempt to
> send the first one caused NET_XMIT_CN, then
> based on your comment below about UDP being throttled, I assume
> the other 4 are kept until later?
It only has an effect on TCP, it causes it to decrease the
congestion window limits.
I did not state that it had any effect on UDP. Just because I
talk about UDP later in my email doesn't mean the two things
are related.
next prev parent reply other threads:[~2010-08-27 5:35 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-25 19:00 [net-next 1/2] qdisc: Allow qdiscs to provide backpressure up the stack Ben Greear
2010-08-25 19:00 ` [net-next 2/2] macvlan: Enable qdisc backoff logic Ben Greear
2010-08-25 19:24 ` Arnd Bergmann
2010-08-25 19:27 ` Ben Greear
2010-08-25 19:38 ` Hagen Paul Pfeifer
2010-08-25 19:49 ` Ben Greear
2010-08-25 19:59 ` Arnd Bergmann
2010-08-25 20:49 ` Ben Greear
2010-08-26 13:55 ` Arnd Bergmann
2010-08-26 15:33 ` Ben Greear
2010-08-26 17:45 ` Ben Greear
2010-08-27 13:16 ` Arnd Bergmann
2010-08-25 20:44 ` [net-next 1/2] qdisc: Allow qdiscs to provide backpressure up the stack Stephen Hemminger
2010-08-25 20:56 ` Ben Greear
2010-08-26 22:59 ` David Miller
2010-08-27 4:14 ` Ben Greear
2010-08-27 4:34 ` David Miller
2010-08-27 5:22 ` Ben Greear
2010-08-27 5:36 ` David Miller [this message]
2010-08-27 5:58 ` Ben Greear
2010-08-27 6:11 ` David Miller
2010-08-27 15:26 ` Ben Greear
2010-08-27 15:59 ` Eric Dumazet
2010-08-27 17:00 ` Ben Greear
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