Hi all, I have investigated the problem a little, and here are some results:
First of all, it has nothing to do with memory consumption. The smtpd crashes on statfs() in fsspase() function, which is called from smtpd_check_queue() to check available free space on current filesystem for a queue. In the suggested System.map file the closest entry is 'alloc_page_buffers'. The default_process_limit, qmgr_message_active_limit and qmgr_message_recipient_limit tweaks have no effect at all. Any thoughts why statfs() may trigger a kernel oops? Best regards, Denis Shulyaka 2011/3/4 Wietse Venema <wie...@porcupine.org>: > Wietse: >> > Postfix asks the kernel for memory. If the kernel oopses and crashes >> > Postfix, then that can't be fixed by changing Postfix. > > Denis Shulyaka: >> How much memory does smtpd need to receive a message, approximately? >> Can I tweak this value somehow? > > First, you can't run Postfix on a kernel that oopses and sends > signal 11 when Postfix asks for memory. It should report the > memory shortage to Postfix instead. > > The amount of memory depends on libc, and on what else you linked > into Postfix: OpenSSL, PCRE, LDAP, and so on quickly add up to the > memory footprint. > > The biggest tweak is reducing default_process_limit by a factor 10 > or more. Other tweaks are reducing qmgr_message_active_limit and > qmgr_message_recipient_limit by a factor 10 or more. > > Wietse >
