Re: low speed writing in device

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On 19 August 2013 10:47, Josep Lladonosa <jlladono@xxxxxxxxx> wrote:
> Hello,
>
>
> I wrote some days ago about low rates on "intense" writes, and tried
> the given patch in the reply. It did not work for me.
> Kernel 3.11.0-rc5 with last bcache from git was also not solving this issue.
>
> Today I have tried  3.11.0-rc6 and unfortunately, I get similar results.
> I add here results of iostat while dpkg -i linux-headers (or
> installation of a linux-image). They take minutes, minutes,
> minuuuuuutes... ;)
>
>
> # iostat -d 5
> Linux 3.11.0-rc6 (minijep)     19/08/13     _x86_64_    (8 CPU)
>
> Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
> sda              19,70        78,48       350,69      34506     154188
> sdb              64,05       913,99       306,53     401856     134772
> bcache0          96,15       915,06       350,68     402322     154184
>
> Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
> sda             409,20         0,80     14871,20          4      74356
> sdb            1299,60         6,40     10969,60         32      54848
> bcache0        2434,00         7,20     14871,20         36      74356
>
> Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
> sda              10,60         0,00        26,40          0        132
> sdb              10,80         0,00        67,20          0        336
> bcache0          16,80         0,00        26,40          0        132
>
> Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
> sda              10,40         0,00        15,20          0         76
> sdb              10,60         0,00        56,80          0        284
> bcache0          13,80         0,00        15,20          0         76
>
> Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
> sda              10,60         0,00        16,80          0         84
> sdb              10,60         0,00        56,80          0        284
> bcache0          14,40         0,00        16,80          0         84
>
> Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
> sda              10,80         0,00        28,00          0        140
> sdb              11,20         0,00        70,40          0        352
> bcache0          17,20         0,00        28,00          0        140
>
> Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
> sda             125,60         0,00      3951,20          0      19756
> sdb              22,20         0,00      3906,40          0      19532
> bcache0         971,20         0,00      3951,20          0      19756
>
> Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
> sda              16,40         0,00       274,40          0       1372
> sdb              18,40         0,00       327,20          0       1636
> bcache0          22,00         0,00       274,40          0       1372
>
> Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
> sda              10,60         0,00        15,20          0         76
> sdb              10,60         0,00        55,20          0        276
> bcache0          13,80         0,00        15,20          0         76
>
>
>
>
> --
> --
> Salutacions...Josep
> --


Hello,

I saw http://evilpiepirate.org/git/linux-bcache.git/commit/?h=bcache-for-3.11&id=9df79a37eeb7ee89dc56aeed3051be676369359a

and have patched 3.11.0-rc6 with it.

This eliminates the delay. Now a kernel image installs in about 20
seconds. :) Thanks!



-- 
--
Salutacions...Josep
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