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<div bgcolor="#ffffff" text="#000000"><br>On the other hand, Large readdir RPCs is basic of another metadata read performance improvement features - "readdir+", which is quite useful for "ls -l" operation (for large directory), and reduce lookup/getattr RPC as much as possible. In such feature, MDS will pack more dir-item's attribute (not only name/ino as does currently by readdir, but also mode/owner, and etc) information back to client-side in "readdir+" RPC. That means the dir-item count in one "readdir+" page is less than in the traditional readdir page, then more pages to be sent back to client. If without "Large readdir RPCs", the advantage of "readdir+" will be discounted.<br>
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<div>I'd be interested in working this as well but probably as a separate effortsinceSOM isn'tin 1.8 and that's my main focus. In our testing, SOM hadsignificant benefits over the WAN and I'd expect even betterfrom readdir+. I have tried Oleg's patch for asynchronousll_glimpse_size but oddlyI've seen someone erradic performancewhere at times it was worse then statahead and synchronous ll_glimpse_size.</div>
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<div>Jeremy</div>
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