[Mldonkey-users] [patch #5203] Swarmer: Anti-fragmentation

[spiralvoice]

Follow-up Comment #1, patch #5203 (project mldonkey):

Updated patch (+1 line for logging):
ftp://ftp.berlios.de/pub/mldonkey/pango/anti-fragmentation_v7.patch

Add another criterion for selecting blocks: prefer blocks already
fully preallocated on disk; That way one can get antifragmentation
benefits without preallocating too much space, specially for downloads
with small chunks (BitTorrent comes to mind).

Only fully preallocated blocks get a higher priority; Also selecting
partially preallocated blocks could have an unwanted "domino effect"
(since network and disk blocks don't match, partially downloaded
chunks will be surrounded by partially preallocated chunks, that would
in turn be picked in priority for downloading, etc. So downloads would
mainly happen in "waves" of up and down block numbers).

(Currently, another download pattern will probably also appear by
selection fully preallocated blocks: blocks will be downloaded in
"clusters" of nearby blocks. Whether this pattern is harmless for file
propagation needs checking).

Untested.
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Additional Item Attachment:

File name: 5203_2.patch                   Size:14 KB
updated version, pango v7
<http://savannah.nongnu.org/patch/download.php?file_id=10351>

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