>> What happens is, that as soon as I write a bigger e-mail, the system >> load goes up from 0 to around 2.5 and when the mail is send, goes back >> to 0 again, but there is almost no cpu usage at all. So it should have >> something to do with the I/O system I guess. iotop tells me that >> cleanup is writing at around incredible 60 kb/s to the disk. > > Try running `dstat -tcdngym -D sda,sdb', changing the list of disks to > match yours, leaving it to bed in so you know what's normal, and then > doing smtp-source to trigger the problem. You might see high `wai', > `wait' percentages showing processes are stalled waiting for I/O. > wait goes directly up from 0 to 50 and stays there
>> I can even copy to the same partition at normal speed. > > What type of filesystems are being used? > It's still ext3
