From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Zhuravlev Date: Tue, 26 Jan 2010 13:02:32 +0300 Subject: [Lustre-devel] proposal on implementing a new readahead in clio In-Reply-To: <4B56F907.3090308@sun.com> References: <4B56F907.3090308@sun.com> Message-ID: <4B5EBDB8.1030303@sun.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lustre-devel@lists.lustre.org Hi, I think we could help a lot if you restructure the proposal a bit: first of all, describe the algorithm w/o implementation details, probably using notion of event: read event extending window, io to get data ahead, read-ahead io completion, hit/miss, etc. then map these events to specific code paths? explain what kind of information/mechanism layers miss to implement the algorithm? z. On 1/20/10 3:37 PM, jay wrote: > Hello, > > We have discussed the implementation of new readahead in CLIO. Here I > just send the design document out to ask for comments. > > We have already had several inputs from Z(aka bzzz) and other engineers. > I'm not going to copy those ideas here directly, because I'm afraid to > distort something, so please reply this email to show your ideas - > thanks in advance. > > Jay > > > > _______________________________________________ > Lustre-devel mailing list > Lustre-devel at lists.lustre.org > http://lists.lustre.org/mailman/listinfo/lustre-devel