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2004 Jun 16
3
[Bug 1463] New: poor performance with large block size
...ntact: rsync-qa@samba.org
I have a 29Gig file that is the previous version of a file and a 1.3 Gig
incremental backup of the file. I did the transfer with no block size option
and it takes about 6 minutes (GigEthernet). I used --block-size = 90k and it
took about 6 minutes. I used --block-size=182000 (close to the square root of
29 Gig) and it only completed ~50 Meg of transfer of the 1.3 Gig in a couple of
hours.
Chris Shoemaker suggests this is a problem with the sliding window being a
fixed size of 256k and that the block size will not allow multiple blocks in
the window size.
Operati...