Herbert Xu wrote:
On Tue, Jul 29, 2008 at 07:00:46AM +0200, Patrick McHardy wrote:
That sounds like a pretty neat idea. I'm testing a patch now, I'll
send it over in a few minutes if it survives :)
Awesome! I'll try this out on my router.
This seems to work. I'm wondering however if this will really help.
We already track retransmissions and decrease the timeout on the
3rd retransmission, so this should only help if both the sender and
the receiver went down.
The problem with requiring a 3rd retransmit is that once a socket
is orphaned (closed) on Linux, we fast-track the retransmit timeout
process. In particular, if it's already maxed out the RTO prior
to closing, we'll kill it straight away.
This is in violation of the RFCs but it's an important optimisation.
Thanks for this explanation. Unless Jozsef sees something wrong with this
patch, I'll queue it with a proper changelog. Its small enough, so perhaps
we can even put this in 2.6.27.
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