linux-kernel - Re: [PATCH] scsi_ram: a RAM-based SCSI driver

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Message-ID: <50C06EC3.20002@redhat.com>
Date:	Thu, 06 Dec 2012 11:09:07 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi_ram: a RAM-based SCSI driver

Il 05/12/2012 17:45, Kirill A. Shutemov ha scritto:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> 
> This driver is intended to run as fast as possible, hence the options to
> discard writes and reads. It's designed to let us find latency issues
> elsewhere in the storage stack (eg filesystem, block layer, scsi layer).
> 
> There are a few different options, controlled through module parameters.
> The sector size and disc capacity are load-time parameters, but the
> parameters affecting performance are tweakable at runtime.
> 
> By default, it'll allocate half a gigabyte of RAM to use as a ramdisc;
> you can change this with the `capacity' module parameter.

Is this that much faster than scsi-debug?  The discarding options surely
can be added there.

Paolo
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