Thanks to Dan Kegel
for this link.
Three kernel performance problems that caused Apache to do
poorly on Linux have been identified and partially resolved. Most
recently, an SMP scaling bottleneck was found, and a three-line
patch was posted that quadrupled performance on one test (erasing
the SMP penalty). See On Mindcraft’s April
1999 Benchmark (updated May 21, 1999) for continuing coverage
of the issues and solutions.