On Wed, 9 May 2007, Andrew Morton wrote:
>> erm, it's not obviosu from all this that the patches are worth
>> with, are they?
>What was it? 0.5% performance improvement on a synthetic benchmark?
>Process wakeup I believe?
The initial patch and discussion is from:
Yes, the runqueue patch has a 0.5% perf improvement on database
workload(which is a good improvement for this workload).
The theory behind the patches is:
1. Minimize number of cache lines that are touched during a remote
access. On Numa system, remote access is more expensive than local.
2. Do not share cache line between remote accessed data and local
accessed data. Local data update may cause remote access cache miss and
wait for longer time.
Although the patches themselves don't save or waste per_cpu size, the
above two reasons are good to have them in.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Video 4 Linux]
[Linux for the blind]