Messages in this thread | | | From | Roger Larsson <> | Subject | Re: Linux 2.4.17-rc1 | Date | Fri, 14 Dec 2001 02:35:47 +0100 |
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On Thursday den 13 December 2001 21.44, Marcelo Tosatti wrote: > Hi, > > I've just copied 2.4.17-rc1 to ftp.kernel.org... Its mirroring yet, > probably. > > Well, I want people with the "unfreeable" buffer/cache problem to confirm > with me that 2.4.17-rc1 is working ok. > > The same change which should fix that problem also should make 2.4 a bit > less "swap happy". > >
Hi,
I have run some "files bigger than memory" (streaming) tests. Some significant differences with earlier kernel:
* write - lowered throughput (26 MB/s => 22 MB/s)
* copy - throughput better by 2/3 (16 MB/s => 25 MB/s) !
* dbench 32 - back down to lower than 2.4.12 (due to increased fairness?) 2.4.11 18.9 MB/s 2.4.12 23.3 MB/s 2.4.16 34.9 MB/s 2.4.17-rc1 20.3 MB/s 2.4.17-rc1 (file-readahead:1000) 24.5 MB/s [lets forget about them now...]
* diff - usage of "file-readahead" more than doubles efficency (most-kernels: 11 MB/s => 2.4.17-rc1 with readahead: 25 MB/s)
The nicest thing is that it is the first kernel where readahead tuning is not necessary for the copy operation. Now it is only multiple-big-concurrent-reads that _needs_ "file-readahead"
/RogerL
-- Roger Larsson Skellefteå Sweden - 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/
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