Message-ID: <44749F19.1020705@namesys.com>
Date: Wed, 24 May 2006 10:59:53 -0700
From: Hans Reiser <reiser@namesys.com>
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To: Tom Vier <tmv@comcast.net>
CC: Linux-Kernel@vger.kernel.org,
       Reiserfs developers mail-list <Reiserfs-Dev@namesys.com>,
       Reiserfs mail-list <Reiserfs-List@namesys.com>,
       Nate Diller <ndiller@namesys.com>
Subject: Re: [PATCH] updated reiser4 - reduced cpu usage for writes by writing
 more than 4k at a time (has implications for generic write code and eventually
 for the IO layer)
References: <44736D3E.8090808@namesys.com> <20060524175312.GA3579@zero>
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I should add, you execute a lot more than 4k worth of instructions for
each of these 4k writes, thus performance is non-optimal.  This is why
bios exist in the kernel, because the io layer has a similar problem
when you send it only 4k at a time (of executing a lot more than 4k of
instructions per io submission).The way the io layer handles bios is not
as clean as it could be though, Nate can say more on that.
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