Re: [RFC/PATCH 2/2] block: Adding ROW scheduling algorithm

[Jan Engelhardt]

On Wednesday 2012-09-19 07:29, Jan Engelhardt wrote:
>On Monday 2012-08-06 18:35, Jeff Moyer wrote:
>>Tatyana Brokhman writes:
>>
>>> This patch adds the implementation of a new scheduling algorithm - ROW.
>>> The policy of this algorithm is to prioritize READ requests over WRITE
>>> as much as possible without starving the WRITE requests.
>>
>>Perhaps you could start off by describing the workload, and describing
>>why the existing I/O schedulers do not perform well.

There seems to a bug with ROW. After about 43 hours of continued
operation, programs (./configure was what I ran at the time this
happened) first become slow, then got stuck in D state within a
minute. Ctrl-C/Z worked at first, soon not, then these messages
appeared in dmesg.

[319952.630605] row: forced dispatching is broken (nr_sorted=17), please report
this
[319952.631174] row: forced dispatching is broken (nr_sorted=17), please report
this
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/