Re: [PATCH] backing dev unplugging

[Andrew Morton]

jbarnes@xxxxxxx (Jesse Barnes) wrote:
>
> -------------------------------------
> w/Jens' patch: ~47149 I/Os per second

Happier.

>   [root@revenue sio]# readprofile -m /root/System.map | sort -nr +2 | head -20
>   181993 default_idle                             5687.2812
>   624772 snidle                                   1627.0104
>   209129 cpu_idle                                 435.6854
>     4755 dio_bio_end_io                            12.3828
>     6593 scsi_end_request                          12.1195
>      435 ia64_spinlock_contention                   6.7969
>     2959 sn_dma_flush                               4.4033

Do you know where that spinlock contention is coming from?

(We have a little patch for x86 which places the spinning code inline in the
caller of spin_lock() so it appears nicely in profiles.)
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