On Thu, 24 Jul 2008, Herbert Xu wrote:

Ingo Molnar [off-list ref] wrote:

quoted

the client (running 2.6.24) does periodic 120 seconds retransmits:

07:40:48.255452 IP dione.39201 > phoenix.distcc: . 1608:2144(536) ack 1 win 584007:40:48.255547 IP phoenix.distcc > dione.39201: . ack 2144 win 65535
07:40:48.255564 IP dione.39201 > phoenix.distcc: . 67143:67679(536) ack 1 win 5840
07:40:48.255648 IP phoenix.distcc > dione.39201: . ack 2144 win 65535
07:42:48.255440 IP dione.39201 > phoenix.distcc: . 2144:2680(536) ack 1 win 5840
07:42:48.255559 IP phoenix.distcc > dione.39201: . ack 2680 win 65535
07:42:48.255570 IP dione.39201 > phoenix.distcc: . 67679:68215(536) ack 1 win 5840
07:42:48.255659 IP phoenix.distcc > dione.39201: . ack 2680 win 65535
07:44:48.255436 IP dione.39201 > phoenix.distcc: . 2680:3216(536) ack 1 win 584007:44:48.255570 IP phoenix.distcc > dione.39201: . ack 3216 win 65535
07:44:48.255585 IP dione.39201 > phoenix.distcc: . 68215:68751(536) ack 1 win 5840
07:44:48.255669 IP phoenix.distcc > dione.39201: . ack 3216 win 65535

OK, something's seriously screwed up on dione's kernel.  Could
you please disable syncookies (which should enable SACK for you)
and see if the problem goes away?

This looks like the FRTO bugs we fixed in 2.6.25.7, afaik, 2.6.24.y wasn't 
anymore updated at that time so it's a bit obsolete...


-- 
 i.