diff options
author | Paul Jakma <paul@quagga.net> | 2010-01-11 16:33:07 +0000 |
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committer | Paul Jakma <paul@quagga.net> | 2010-12-08 16:53:09 +0000 |
commit | 2613abe64fe48761d798942af8dc0ec90c804b22 (patch) | |
tree | c0f75f40bbd005bdd9d5545209a9402715c4f381 /.cvsignore | |
parent | 8526100eebf9c56ff6fac2b80938b232bb687946 (diff) |
lib: Thread scheduler should be fair and not let events starve I/O and timers
* thread.c: (thread_fetch) the current scheduler will service events
indefinitely, ignoring I/O and timers, so long as there are events.
In other words, events can crowd out I/O and timers. In theory this
shouldn't be a huge problem as events are generated only by timers
and I/O, however in practice it means normal-load behaviour is not as
useful a predictor of high-load behaviour as it should be.
Fix this by considering all the kinds of threads, in every run of the
scheduler. For any given run, we prioritise events, however across
runs the scheduler should be fair.
This has been observed to give more stable inter-packet times in
testing of ospfd (i.e. lower std-dev).
(thread_process) new heler to queue all the given threads onto the ready
list
Diffstat (limited to '.cvsignore')
0 files changed, 0 insertions, 0 deletions