Re: [Ext2-devel] Re: [RFC] ext3 writepages for writeback mode

[Badari Pulavarty <pbadari@us.ibm.com>]

Alex Tomas wrote:
>>>>>>Badari Pulavarty (BP) writes:
> 
> 
>  BP> Test: writes 10,000 blocks of 64k and does fdatasync().
> 
> The patch doesn't apply ;) after a minor correction
> I've tested the patch too:
> 
> SMP, before:
> [root@bob root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m17.748s user    0m0.032s sys     0m6.031s
> 
> [root@bob root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m16.016s user    0m0.015s sys     0m3.819s
> 
> [root@bob root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m19.074s user    0m0.014s sys     0m3.761s
> 
> [root@bob root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m22.011s user    0m0.010s sys     0m3.773s
> 
> 
> SMP, after:
> [root@bob root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m20.676s user    0m0.023s sys     0m5.643s
> 
> [root@bob root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m13.188s user    0m0.016s sys     0m3.511s
> 
> [root@bob root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m23.725s user    0m0.017s sys     0m3.399s
> 
> [root@bob root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m23.684s user    0m0.013s sys     0m3.421s 
> 
> 
> 
> UP, after:
> [root@zefir root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m21.452s user    0m0.026s sys     0m6.105s
> 
> [root@zefir root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m23.317s user    0m0.027s sys     0m4.206s
> 
> [root@zefir root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m25.190s user    0m0.022s sys     0m4.026s
> 
> [root@zefir root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m25.024s user    0m0.021s sys     0m4.103s
> 
> 
> UP, before:
> [root@zefir root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m19.138s user    0m0.021s sys     0m5.980s
> 
> [root@zefir root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m23.123s user    0m0.026s sys     0m4.083s
> 
> [root@zefir root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m25.152s user    0m0.017s sys     0m3.836s
> 
> [root@zefir root]# time /work/tests/fwrite /test/fff 64 10000
> real    0m25.217s user    0m0.026s sys     0m3.827s
> 
> 
> 
> 
> AFAICS, the patch makes sense, but in my setup it doesn't
> reduce sys.time so dramatically. all my boxes are P3-based.
> 
> thanks, Alex
> 
> 

Thank you for testing and confirming the results.
Is this on a simple single disk configuration ?

Thanks,
Badari