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Date: Thu, 21 Apr 2011 04:04:12 -0400 From: Christoph Hellwig <hch@...radead.org> To: Ian Campbell <Ian.Campbell@...rix.com> Cc: Christoph Hellwig <hch@...radead.org>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, "jaxboe@...ionio.com" <jaxboe@...ionio.com>, "xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Stefano Stabellini <Stefano.Stabellini@...citrix.com>, "konrad@...nel.org" <konrad@...nel.org> Subject: Re: [Xen-devel] Re: [PATCH v3] xen block backend. On Thu, Apr 21, 2011 at 08:28:45AM +0100, Ian Campbell wrote: > On Thu, 2011-04-21 at 04:37 +0100, Christoph Hellwig wrote: > > This should sit in userspace. And last time was discussed the issue > > Stefano said the qemu Xen disk backend is just as fast as this kernel > > code. And that's with an not even very optimized codebase yet. > > Stefano was comparing qdisk to blktap. This patch is blkback which is a > completely in-kernel driver which exports raw block devices to guests, > e.g. it's very useful in conjunction with LVM, iSCSI, etc. The last > measurements I heard was that qdisk was around 15% down compared to > blkback. Please show real numbers on why adding this to kernel space is required. -- 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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