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293372Re: Weird throttling since midnight

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  • The Doctor
    May 26, 2013
      On Sun, May 26, 2013 at 09:51:41AM -0400, Wietse Venema wrote:
      > The Doctor:
      > > On Sun, May 26, 2013 at 06:37:17AM -0600, The Doctor wrote:
      > > > On Sun, May 26, 2013 at 08:04:47AM -0400, Wietse Venema wrote:
      > > > > The Doctor:
      > > > > > All right, I have been getting a lot of irregular throttling
      > > > > > since Saturday midnight.
      > > > > >
      > > > > > May 25 08:05:53 doctor postfix/postscreen[29851]: fatal: set DB cache size 131072: Invalid argument
      > > > >
      > > > > Has your Berkeley DB library been updated? Perhaps you can revert
      > > > > the update.
      > > > >
      > > > > Apparently, their set_cachesize() function now returns an error
      > > > > when Postfix sets the cache size.
      > > > >
      > > > > This code has not changed since Postfix 2.0, more than 10 years ago:
      > >
      > > I take it back.
      > >
      > > Also the BDB is 5.3.21 which is the latest.
      > >
      > > Here are the logs from the latest backfire
      >
      > That is the same Berkeley DB error. You can stop posting these now.
      > You may make more progress if you can back out the "improved"
      > Berkeley DB library.

      Correct about the word "improved". I might have a 4.7 or 4.8
      lying around let me check.

      In the mean time

      >
      > You may also play with berkeley_db_read_buffer_size. The Berkeley
      > DB documentation promises that they accept buffer sizes of 20kB or
      > more, and their default is 256kB. If someone has screwed up Berkeley
      > DB, then perhaps it helps to specify berkeley_db_read_buffer_size
      > of 262144 (262144 = 256*1024). Hopefully they still accept that.

      What tweak is needed in the main.cf to make such a change?

      >
      > http://docs.oracle.com/cd/E17076_02/html/api_reference/C/dbset_cachesize.html
      >
      > Wietse

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