linux-kernel - Re: Increased memory usage with scsi-mq

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Message-ID: <20170805084436.GA14264@lst.de>
Date:   Sat, 5 Aug 2017 10:44:36 +0200
From:   Christoph Hellwig <hch@....de>
To:     "Richard W.M. Jones" <rjones@...hat.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        pbonzini@...hat.com
Subject: Re: Increased memory usage with scsi-mq

On Fri, Aug 04, 2017 at 10:00:47PM +0100, Richard W.M. Jones wrote:
> I read your slides about scsi-mq and it seems like a significant
> benefit to large machines, but could the out of the box defaults be
> made more friendly for small memory machines?

The default inumber of queues and queue depth and thus memory usage is
set by the LLDD.

Try to reduce the can_queue value in virtio_scsi and/or make sure
you use the single queue variant in your VM (which should be tunable
in qemu).