[SSI-devel] [ ssic-linux-Feature Requests-1738728 ] CFS server to support UIO

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Feature Requests item #1738728, was opened at 2007-06-17 14:23
Message generated for change (Comment added) made by rogertsang
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Category: Filesystem
Group: 1.9
Status: Open
Priority: 5
Private: No
Submitted By: Roger Tsang (rogertsang)
Assigned to: Roger Tsang (rogertsang)
Summary: CFS server to support UIO

Initial Comment:
To add pagevec so CFS can support larger than 64KB of coalesced pages on wire.

Also this will allow CFS to copy straight to the network as the implementation of buffers to resolve bug 1736236 doesn't.

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>Comment By: Roger Tsang (rogertsang)
Date: 2007-07-03 00:38

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Sending the iov_len's along with each iovec for coalesced WRITE.

Note: VFS only supports up to 32KBytes per coalesced request.

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Comment By: Roger Tsang (rogertsang)
Date: 2007-07-01 10:18

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Testing send coalesced iov's to PFS for read/write.  I've abandoned
pagevec for kvec.

There is a race writing iov's over wire under load unless we piggyback
each iov's length while marshalling - due to limitations in the generated
RPC's.  Until I try piggyback we avoid the race by falling back to
coalesced buffered WRITE when writing over wire.

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Comment By: Roger Tsang (rogertsang)
Date: 2007-06-18 17:50

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Got CFS pagevec working for reads.

Correction: Without pagevec, CFS can only buffer up to 32KB on wire due to
limits in lower-level RPC.

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Comment By: Roger Tsang (rogertsang)
Date: 2007-06-17 14:36

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FYI I've already made some progress.

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