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Date: Fri, 20 Mar 2009 16:25:41 -0700 From: "H. Peter Anvin" <h.peter.anvin@...el.com> To: Ilya Yanok <yanok@...raft.com> CC: "H. Peter Anvin" <hpa@...or.com>, "Williams, Dan J" <dan.j.williams@...el.com>, "linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "neilb@...e.de" <neilb@...e.de>, "Sosnowski, Maciej" <maciej.sosnowski@...el.com>, Yuri Tikhonov <yur@...raft.com> Subject: Re: [PATCH 06/13] async_tx: add support for asynchronous GF multiplication Ilya Yanok wrote: >>> >> That doesn't explain what you expect the code to do. It still doesn't >> make sense to me. > > We defined async_pq() function as hardware can do GF multiplication of > arbitrary elements and we want to take advantage of this fact. But by > the design of ASYNC_TX API we have to provide synchronous version of > that function too. > I don't think that makes sense since the algorithm doesn't use vector-vector multiplications and there is no need for them. As such, you're actively excluding support for hardware which only provides scalar-vector multiplication, even though that is all we need. In fact, vectorizing the constant doesn't make much sense. -hpa -- 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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