1,In the code,readdir-ahead didn't package up the readdir request into a bigger
request, it just packaged up the dentries, if the dentries' size was greater
than the request size, the bigger request returned to the client, wasn't it?
2,The requests from the Readdir-ahead Xlator wind down to next Xlator ,did they
send to a server or brodcast to all the servers?
3,As you have said, the preload is in progress, a readdir from application
waits for its completion. And If I change the buffer(request) size, will the
application wait for a long time? Could it be a stream, the readdir from
application fetches dentries in the buffer, and the readdir-ahead xlator
pre-fetches dentries from the servers?
4,When does it can be a larger buffer, like io-cache,which cached the
data/dentries read before? As you know, ls is so slow.
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