Em Thu, 04 Sep 2008 15:34:30 +0330
"Hamid R. Jahanjou" escreveu:| From: Hamid R. Jahanjou
|
| Implements the idea of swap-out page clustering from *BSD for
| Linux. Each time a candidate page is to be swapped out,
| virtually-nearby pages are scanned to find eligible pages to be
| swapped out too as a cluster. This technique increases the likelihood of
| bringing in related data on a page fault and decreases swap space
| fragmentation in the long run. Currently, Linux searches only
| physically-nearby pages which is not optimal since, over time, physically-
| adjacent pages may become unrelated.
|
| The code can be statically tuned. No benchmarks. I'm not sure whether
| the added complexity is acceptable.Sorry for this (very) late response, but I ran some very simple tests
this week and thought you might be interested in the results.The test machine has 512MB of RAM. For the tests I booted with 64MB
and setup a 512MB swap file.For the first test I let an allyesconfig kernel building for several
hours with six jobs (make -j6). I did not have any problems, so
considering that your code was used I think it is stable enough.In the second test I have built an allnoconfig kernel with and without
your patches, still with six jobs. Results:2.6.27-rc7-vanilla 44:12 minutes
2.6.27-rc7-pgc 52:09 minutes(pgc means page-clustering patches).
For both builds I did not change any swap paramenter and I could
observe that about 80MB of swap were used most of the time.But please, note that these tests were quite far from being 'scientific'
eg. I should have built the kernel more times and should have tried other
setups...I will wait for the next version of the patches to run more serious
tests.--
Luiz Fernando N. Capitulino
--
| KOSAKI Motohiro | [bug?] tg3: Failed to load firmware "tigon/tg3_tso.bin" |
| Faik Uygur | Re: Linux 2.6.21-rc1 |
| Greg KH | [GIT PATCH] driver core patches against 2.6.24 |
| Trent Piepho | [PATCH] [POWERPC] Improve (in|out)_beXX() asm code |
git: | |
| Jarek Poplawski | [PATCH] pkt_sched: Destroy gen estimators under rtnl_lock(). |
| David Miller | [GIT]: Networking |
| Gerrit Renker | [PATCH 27/37] dccp: Integration of dynamic feature activation - part 2 (server side) |
| Jens Axboe | Re: [BUG] New Kernel Bugs |
