Re: Mail drop

From: Wietse Venema (no email)
Date: Mon Mar 23 2009 - 19:42:28 EDT

  • Next message: Sahil Tandon: "Re: Best method to throttle mail to one user"

    Victor Duchovni:
    > On Mon, Mar 23, 2009 at 07:24:50PM -0400, Wietse Venema wrote:
    > > Victor Duchovni:
    > > > and may be causing high disk latency. You have to tune the milter configuration
    > >
    > > There is no need for dkim-milter to touch the disk. It receives
    > > header and body content from Postfix via the Milter protocol. I
    > > know this, because I implemented the Postfix side of the protocol.
    > No need perhaps, but does that prove that no disk I/O takes place? I am
    > not saying there is disk I/O, but lack of need is not lack of use. So
    > that should be excluded. If the disk is not saturated, perhaps there
    > are DNS lookups or other sources of latency.

    dkim-milter does not store the email message outside the mail queue.
    In signing mode, it receives the headers and body from Postfix,
    and then it asks Postfix to add a message header with the DKIM

    dkim-milter does not use DNS lookups while signing mail. It has
    a copy of the private key.

    dkim-milter does of course use DNS lookups when verifying signatures.
    It is possible that he is running it in verify mode, and that his
    DNS has a 13ms round-trip time over a slow 128kbps ADSL uplink.
    But it seems unlikely.

    > Tracing the system calls in the milter may help (when sending just
    > one message to reduce confusion).

    strace-ing a multi-threaded program, have fun.


  • Next message: Sahil Tandon: "Re: Best method to throttle mail to one user"

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