Re: [PATCH 2/2 net-next] tcp: sk_add_backlog() is too agressive for TCP

[Eric Dumazet <eric.dumazet@xxxxxxxxx>]

On Mon, 2012-04-23 at 13:57 -0700, Rick Jones wrote:
> On 04/23/2012 01:37 PM, Eric Dumazet wrote:
> > In my 10Gbit tests (standard netperf using 16K buffers), I've seen
> > backlogs of 300 ACK packets...
> 
> Probably better to call that something other than 16K buffers - the send 
> size was probably 16K, which reflected SO_SNDBUF at the time the data 
> socket was created, but clearly SO_SNDBUF grew in that timeframe.
> 


Maybe I was not clear : Application does sendmsg() of 16KB buffers.

Yet, in the small time it takes to perform this operation, softirq can
queue up to 300 packets coming from the other side.



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html