Poul-Henning Kamp wrote: > In message <49fab28f.2040...@loman.net>, Nick Loman writes: >> Poul-Henning Kamp wrote: > >> Which way round do you mean? >> >> Apache specifies Keep-Alive in seconds, and my sites will certainly die >> if I set it to even 1 second. > > Tell the apache developers to get their act together then.
Hi Poul-Henning, I'm sure I could find a way of getting Apache to put in a 10msec Keep-Alive timeout if that was necessary. Are you proposing that Varnish would then hold and re-use that backend connection for a waiting request from a different user/TCP connection? >> But I would like to eliminate my thousands of TIME_WAIT sockets if at >> all possible, as this represents a scaleability ceiling right now. Of >> course I could just throw more webservers at the problem - if necessary. > > Couldn't you also just configure multiple IP#'s on your backend ? True, I could set up Apache to listen on 16 different ports each on localhost, then set up Varnish to load-balance to those 16 different backends, giving me much greater pool of unique connection entries to work with. The only thing I don't like about this approach is that the kernel is using a lot of memory tracking localhost connections in TIME_WAIT mode that do not need tracking. > If you run a tcpdump of the backend traffic, does the connections > close properly with FIN or does one of the ends RST them ? A single backend request from Varnish -> Apache yields the following tcpdump. It looks correct in that there is: Varnish -> Apache (FIN) Apache -> Varnish (FIN / ACK) Varnish -> Apache (ACK) 11:16:38.304362 IP (tos 0x0, ttl 64, id 18602, offset 0, flags [DF], proto TCP (6), length 60) 127.0.0.1.52192 > 127.0.0.1.8080: S 1321521977:1321521977(0) win 32792 <mss 16396,sackOK,timestamp 177773459[|tcp]> 0x0000: 0000 0000 0000 0000 0000 0000 0800 4500 ..............E. 0x0010: 003c 48aa 4000 4006 f40f 7f00 0001 7f00 .<h...@.@......... 0x0020: 0001 cbe0 1f90 4ec4 d339 0000 0000 a002 ......N..9...... 0x0030: 8018 dbf2 0000 0204 400c 0402 080a 0a98 ........@....... 0x0040: 9b93 0000 .... 11:16:38.304380 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 60) 127.0.0.1.8080 > 127.0.0.1.52192: S 1327228413:1327228413(0) ack 1321521978 win 32768 <mss 16396,sackOK,timestamp 177773459[|tcp]> 0x0000: 0000 0000 0000 0000 0000 0000 0800 4500 ..............E. 0x0010: 003c 0000 4000 4006 3cba 7f00 0001 7f00 .<....@.@.<....... 0x0020: 0001 1f90 cbe0 4f1b e5fd 4ec4 d33a a012 ......O...N..:.. 0x0030: 8000 00b5 0000 0204 400c 0402 080a 0a98 ........@....... 0x0040: 9b93 0a98 .... 11:16:38.304391 IP (tos 0x0, ttl 64, id 18603, offset 0, flags [DF], proto TCP (6), length 52) 127.0.0.1.52192 > 127.0.0.1.8080: ., cksum 0xe8d8 (correct), ack 1327228414 win 257 <nop,nop,timestamp 177773459 177773459> 0x0000: 0000 0000 0000 0000 0000 0000 0800 4500 ..............E. 0x0010: 0034 48ab 4000 4006 f416 7f00 0001 7f00 ....@.@......... 0x0020: 0001 cbe0 1f90 4ec4 d33a 4f1b e5fe 8010 ......N..:O..... 0x0030: 0101 e8d8 0000 0101 080a 0a98 9b93 0a98 ................ 0x0040: 9b93 .. 11:16:38.304552 IP (tos 0x0, ttl 64, id 18604, offset 0, flags [DF], proto TCP (6), length 1190) 127.0.0.1.52192 > 127.0.0.1.8080: P 1321521978:1321523116(1138) ack 1327228414 win 257 <nop,nop,timestamp 177773459 177773459> 0x0000: 0000 0000 0000 0000 0000 0000 0800 4500 ..............E. 0x0010: 04a6 48ac 4000 4006 efa3 7f00 0001 7f00 ....@.@......... 0x0020: 0001 cbe0 1f90 4ec4 d33a 4f1b e5fe 8018 ......N..:O..... 0x0030: 0101 029b 0000 0101 080a 0a98 9b93 0a98 ................ 0x0040: 9b93 4745 ..GE 11:16:38.304567 IP (tos 0x0, ttl 64, id 32365, offset 0, flags [DF], proto TCP (6), length 52) 127.0.0.1.8080 > 127.0.0.1.52192: ., cksum 0xe455 (correct), ack 1321523116 win 274 <nop,nop,timestamp 177773459 177773459> 0x0000: 0000 0000 0000 0000 0000 0000 0800 4500 ..............E. 0x0010: 0034 7e6d 4000 4006 be54 7f00 0001 7f00 ....@.@..T...... 0x0020: 0001 1f90 cbe0 4f1b e5fe 4ec4 d7ac 8010 ......O...N..... 0x0030: 0112 e455 0000 0101 080a 0a98 9b93 0a98 ...U............ 0x0040: 9b93 .. 11:16:38.410471 IP (tos 0x0, ttl 64, id 32366, offset 0, flags [DF], proto TCP (6), length 13079) 127.0.0.1.8080 > 127.0.0.1.52192: P 1327228414:1327241441(13027) ack 1321523116 win 274 <nop,nop,timestamp 177773565 177773459> 0x0000: 0000 0000 0000 0000 0000 0000 0800 4500 ..............E. 0x0010: 3317 7e6e 4000 4006 8b70 7f00 0001 7f00 3...@.@..p...... 0x0020: 0001 1f90 cbe0 4f1b e5fe 4ec4 d7ac 8018 ......O...N..... 0x0030: 0112 310c 0000 0101 080a 0a98 9bfd 0a98 ..1............. 0x0040: 9b93 4854 ..HT 11:16:38.410504 IP (tos 0x0, ttl 64, id 18605, offset 0, flags [DF], proto TCP (6), length 52) 127.0.0.1.52192 > 127.0.0.1.8080: ., cksum 0xb02f (correct), ack 1327241441 win 385 <nop,nop,timestamp 177773565 177773565> 0x0000: 0000 0000 0000 0000 0000 0000 0800 4500 ..............E. 0x0010: 0034 48ad 4000 4006 f414 7f00 0001 7f00 ....@.@......... 0x0020: 0001 cbe0 1f90 4ec4 d7ac 4f1c 18e1 8010 ......N...O..... 0x0030: 0181 b02f 0000 0101 080a 0a98 9bfd 0a98 .../............ 0x0040: 9bfd .. 11:16:38.410509 IP (tos 0x0, ttl 64, id 32367, offset 0, flags [DF], proto TCP (6), length 52) 127.0.0.1.8080 > 127.0.0.1.52192: F, cksum 0xb107 (correct), 1327241441:1327241441(0) ack 1321523116 win 274 <nop,nop,timestamp 177773565 177773459> 0x0000: 0000 0000 0000 0000 0000 0000 0800 4500 ..............E. 0x0010: 0034 7e6f 4000 4006 be52 7f00 0001 7f00 ....@.@..R...... 0x0020: 0001 1f90 cbe0 4f1c 18e1 4ec4 d7ac 8011 ......O...N..... 0x0030: 0112 b107 0000 0101 080a 0a98 9bfd 0a98 ................ 0x0040: 9b93 .. 11:16:38.410576 IP (tos 0x0, ttl 64, id 18606, offset 0, flags [DF], proto TCP (6), length 52) 127.0.0.1.52192 > 127.0.0.1.8080: F, cksum 0xb02d (correct), 1321523116:1321523116(0) ack 1327241442 win 385 <nop,nop,timestamp 177773565 177773565> 0x0000: 0000 0000 0000 0000 0000 0000 0800 4500 ..............E. 0x0010: 0034 48ae 4000 4006 f413 7f00 0001 7f00 ....@.@......... 0x0020: 0001 cbe0 1f90 4ec4 d7ac 4f1c 18e2 8011 ......N...O..... 0x0030: 0181 b02d 0000 0101 080a 0a98 9bfd 0a98 ...-............ 0x0040: 9bfd .. 11:16:38.410587 IP (tos 0x0, ttl 64, id 32368, offset 0, flags [DF], proto TCP (6), length 52) 127.0.0.1.8080 > 127.0.0.1.52192: ., cksum 0xb09c (correct), ack 1321523117 win 274 <nop,nop,timestamp 177773565 177773565> 0x0000: 0000 0000 0000 0000 0000 0000 0800 4500 ..............E. 0x0010: 0034 7e70 4000 4006 be51 7f00 0001 7f00 ....@.@..Q...... 0x0020: 0001 1f90 cbe0 4f1c 18e2 4ec4 d7ad 8010 ......O...N..... 0x0030: 0112 b09c 0000 0101 080a 0a98 9bfd 0a98 ................ 0x0040: 9bfd Regards, Nick. _______________________________________________ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc