On Wed, Mar 04, 2009 at 10:15:05AM +0100, Santiago Romero wrote:
> #### /etc/postfix/master.cf
> slow unix - - - - - smtp
> -o syslog_name=postfix-slow
>
>
> #### /etc/postfix/main.cf
> # Special "slow" transport:
> slow_destination_recipient_limit=1
A really BAD idea, don't do this. Set a recipient limit of at least 2 and
ideally 10 or even the defaul of 50 unless the receiving system enforces
a tighter limit.
> slow_destination_concurrency_limit=1
Unnecessary:
> slow_destination_rate_delay=5
With this you get 5 seconds between deliveries to each destination queue,
but the queues are *per-user* if the recipient limit is 1.
> Stracing qmgr process for a while (before restarting postfix), showed lots
> of lines like:
>
> time(NULL) = 1236156322
> epoll_ctl(8, EPOLL_CTL_DEL, 128, {EPOLLIN, {u32=128,
> u64=13252642876283682944}}) = 0
> fcntl64(128, F_GETFL) = 0x802 (flags O_RDWR|O_NONBLOCK)
> fcntl64(128, F_SETFL, O_RDWR) = 0
> ioctl(128, FIONREAD, [10]) = 0
> poll([{fd=128, events=POLLIN, revents=POLLIN}], 1, 3600000) = 1
> read(128, "status\0000\0\0", 4096) = 10
> gettimeofday({1236156322, 508869}, NULL) = 0
> close(128) = 0
> epoll_ctl(8, EPOLL_CTL_DEL, 129, {EPOLLIN, {u32=129,
> u64=13252642876283682945}}) = 0
> fcntl64(129, F_GETFL) = 0x802 (flags O_RDWR|O_NONBLOCK)
> fcntl64(129, F_SETFL, O_RDWR) = 0
> ioctl(129, FIONREAD, [10]) = 0
> poll([{fd=129, events=POLLIN, revents=POLLIN}], 1, 3600000) = 1
> read(129, "status\0000\0\0", 4096) = 10
> gettimeofday({1236156322, 510488}, NULL) = 0
> close(129) = 0
> alarm(333) = 333
> socket(PF_FILE, SOCK_STREAM, 0) = 13
> fcntl64(13, F_GETFL) = 0x2 (flags O_RDWR)
> fcntl64(13, F_SETFL, O_RDWR|O_NONBLOCK) = 0
> connect(13, {sa_family=AF_FILE, path="private/slow"}, 110) = 0
> gettimeofday({1236156322, 513893}, NULL) = 0
> fcntl64(13, F_DUPFD, 128) = 128
> close(13) = 0
> epoll_ctl(8, EPOLL_CTL_ADD, 128, {EPOLLIN, {u32=128,
> u64=13834671851822907520}}) = 0
> time(NULL) = 1236156322
> socket(PF_FILE, SOCK_STREAM, 0) = 13
> fcntl64(13, F_GETFL) = 0x2 (flags O_RDWR)
> fcntl64(13, F_SETFL, O_RDWR|O_NONBLOCK) = 0
> connect(13, {sa_family=AF_FILE, path="private/slow"}, 110) = 0
> gettimeofday({1236156322, 515731}, NULL) = 0
> fcntl64(13, F_DUPFD, 128) = 129
> close(13) = 0
> epoll_ctl(8, EPOLL_CTL_ADD, 129, {EPOLLIN, {u32=129,
> u64=13834671851822907521}}) = 0
> time(NULL) = 1236156322
> ioctl(3, FIONREAD, [100]) = 0
> time(NULL) = 1236156322
Is it the queue manager that's burning CPU? Nothing too interesting
here.
--
Viktor.
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