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Subject [Bug 53555] New: Scoreboard full error with event/ssl
Date Tue, 17 Jul 2012 02:21:21 GMT

          Priority: P2
            Bug ID: 53555
           Summary: Scoreboard full error with event/ssl
          Severity: normal
    Classification: Unclassified
                OS: FreeBSD
          Hardware: PC
            Status: NEW
           Version: 2.4.2
         Component: mpm_event
           Product: Apache httpd-2

A high-traffic web server using event MPM and mostly receiving HTTPS requests
frequently got the error "scoreboard is full, not at MaxRequestWorkers" and
showed very bad performance.

We fixed the issue by reverting from 2.4.2 to 2.2.22, still using event MPM.

Related httpd.conf settings:

 StartServers 16
 MinSpareThreads 4
 MaxSpareThreads 4
 ListenBacklog 4096
 Timeout 5

Unfortunately don't have a capture of the server status page and increasing the
log level didn't seem to show much.

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