W dniu 18.01.2012 13:03, Wietse Venema pisze:
Konrad Rzepecki:
I have similar problem, and I suspect you may also hit it. In my case I
send ~10k-20k mails through sendmail wrapper. My problem is caused by
fsync done on EVERY queued mail. It take on my servers (4 core AMD @
ext4 @ LVM @ RAID10 @ 8disk) ~ 0.2-0.3s for each one. Sometimes it's
even 0.6s! So simple mail queuing for 15k recipients can take 1 hour or
more...
0.6s for fsync is awful. You need to use a better file system.
I'm afraid this is not only fs issue, but also all layer under it. LVM
and RAID10 must give some time footprint. And in best case data are
written to 2 disks and in worse, due to raid and lvm chunks, to all 8 I
have.
However I've not test which layer is responsible for that.
--
Konrad Rzepecki
