Re: [PATCH] Re: Negative scalability by removal of lock_kernel()?(Was:

dean gaudet
2000-10-29T19:46:13Z

On Sat, 28 Oct 2000, Alan Cox wrote:

> > The big question is: why is Apache using file locking so
> > much? Is this normal behaviour for Apache?
>
> Apache uses file locking to serialize accept on hosts where accept either has
> bad thundering heard problems or was simply broken with multiple acceptors

if apache 1.3 is compiled with -DSINGLE_LISTEN_UNSERIALIZED_ACCEPT it'll
avoid the fcntl() serialisation when there is only one listening port.
(it still uses it for multiple listeners... you can read all about my
logic for that at <http://www.apache.org/docs/misc/perf-tuning.html>.)

is it appropriate for this to be defined for newer linux kernels? i
haven't kept track, sorry. tell me what versions to conditionalize it on.

-dean