Messages in this thread | | | Subject | [Patch 0/4] Reordering of functions, try 2 | From | Arjan van de Ven <> | Date | Mon, 27 Feb 2006 16:23:45 +0100 |
| |
Hi,
This is the second posting of the function reorder patches. I've run a series of lmbench (3.0) runs on the patches earlier today on this set, with the following results (I'll discuss 2 runs, one with the first 3 patches, and one with all patches)
These are descriptions of the results, since the full lmbench run is a LOT of numbers; this is the summary of it
1) There is a whole class of tests where it just doesn't matter at all. In this class are the cpu measurements of FPU ops/second but also the RAM bandwidth tests and the like. This is fully understandable; these tests go straight from userspace->hardware, kernel changes don't impact these.
2) In the "processor/processes" group, 7 tests changed behavior, and the average of these changes was a performance increase by 10% (!!). The exception was the signal handling test, which decreased by 6%. This actually made me feel good, since the original function list was based on a profile run that didn't do signals much if at all.
The second run (with all 4 patches) showed some fluctuations here but on average it was in the noise region. Exception to this was the stat test, which lost half the gain from the first 3 patches. Here also the signals test lost
3) In the latency group, the 3-patches run is again in the 10% gain range. Here the 4-patches run shows an additional gain for several of the tests in the 5% range and for example the af_unix test showed a loss compared to the 3-patches run
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |