kernel: 2.6.14.2
2.6.14.6
2.6.17.8
(and probably others)
After noticing performance problems an strace -Ttt revealed
that select() occasionally stalls while it should not AFAIK:
13:44:26.225471 select(1024, [45], NULL, NULL, {60, 0}) = 1 (in [45], left {60, 0}) <0.000016>
13:44:26.225721 gettimeofday({1157715866, 225768}, {4294967176, 0}) = 0 <0.000012>
13:44:26.225833 recv(45, "g\'0\0\0\0\0\0\0\0\0000\0\0\0\0\0\0\0\0000\0\0\0\0\0\0"..., 147, 0) = 147 <0.000018>
13:44:26.225976 select(1024, NULL, [45], NULL, {5, 0}) = 1 (out [45], left {5, 0}) <0.000018>
13:44:26.226312 send(45, "GG\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 147, 0) = -1 ECONNRESET (Connection reset by peer) <0.000016>
=> 13:44:26.226437 select(1024, NULL, [45], NULL, {5, 0}) = 0 (Timeout) <4.999663>
=> 13:44:31.226300 select(1024, NULL, [45], NULL, {0, 0}) = 0 (Timeout) <0.000018>
=> 13:44:31.226499 select(1024, NULL, [45], NULL, {0, 0}) = 0 (Timeout) <0.000016>
=> 13:44:31.226670 select(1024, NULL, [45], NULL, {0, 0}) = 0 (Timeout) <0.000015>
=> 13:44:31.226839 select(1024, NULL, [45], NULL, {0, 0}) = 0 (Timeout) <0.000016>
=> 13:44:31.227008 select(1024, NULL, [45], NULL, {0, 0}) = 0 (Timeout) <0.000016>
=> 13:44:31.227178 select(1024, NULL, [45], NULL, {0, 0}) = 0 (Timeout) <0.000016>
=> 13:44:31.227351 select(1024, NULL, [45], NULL, {0, 0}) = 0 (Timeout) <0.000016>
=> 13:44:31.227520 select(1024, NULL, [45], NULL, {0, 0}) = 0 (Timeout) <0.000015>
After an ECONNRESET the fd should (still) be considered writable by
select().
--
Frank
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