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Message-ID: <539A9D71.7020504@acm.org> Date: Fri, 13 Jun 2014 08:42:57 +0200 From: Bart Van Assche <bvanassche@....org> To: Christoph Hellwig <hch@....de>, James Bottomley <James.Bottomley@...senPartnership.com> CC: Jens Axboe <axboe@...nel.dk>, Robert Elliot <Elliott@...com>, linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: scsi-mq 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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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