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author | Mike Galbraith <efault@gmx.de> | 2008-05-08 17:00:42 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-05-08 17:00:42 +0200 |
commit | 46151122e0a2e80e5a6b2889f595e371fe2b600d (patch) | |
tree | 61ab1993c1a94765327aeba3b36924b88b81e68f /arch/x86/pci | |
parent | bf726eab3711cf192405d21688a4b21e07b6188a (diff) |
sched: fix weight calculations
The conversion between virtual and real time is as follows:
dvt = rw/w * dt <=> dt = w/rw * dvt
Since we want the fair sleeper granularity to be in real time, we actually
need to do:
dvt = - rw/w * l
This bug could be related to the regression reported by Yanmin Zhang:
| Comparing with kernel 2.6.25, sysbench+mysql(oltp, readonly) has lots
| of regressions with 2.6.26-rc1:
|
| 1) 8-core stoakley: 28%;
| 2) 16-core tigerton: 20%;
| 3) Itanium Montvale: 50%.
Reported-by: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/pci')
0 files changed, 0 insertions, 0 deletions