lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 13 Jun 2014 08:42:57 +0200
From:	Bart Van Assche <>
To:	Christoph Hellwig <>,
	James Bottomley <>
CC:	Jens Axboe <>, Robert Elliot <>,,
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.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists