Re: scsi-mq

[Bart Van Assche]

On 06/12/14 15:48, Christoph Hellwig wrote:
> The usage of blk-mq dramatically decreases CPU usage under all workloads going
> down from 100% CPU usage that the old setup can hit easily to usually less
> than 20% for maxing out storage subsystems with 512 byte reads and writes,
> and it allows to easily achieve millions of IOPS. Bart and Robert have
> helped with some very detailed measurements that they might be able to send
> in reply to this, although these usually involve significantly reworked low
> level drivers to avoid other bottle necks.

Thanks Christoph for writing up this excellent summary. In case anyone
is wondering which LLD changes Christoph is referring to: the tests I
ran myself were with an SRP initiator driver modified to use multiple
RDMA channels between initiator and target instead of a single channel.
I will post these changes for review on the linux-rdma mailing list as
soon as I have the time.

Bart.

--
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/