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-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
