https://bugzilla.samba.org/show_bug.cgi?id=1463
Summary: poor performance with large block size
Product: rsync
Version: 2.6.2
Platform: x86
OS/Version: other
Status: NEW
Severity: normal
Priority: P3
Component: core
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
QAContact: [EMAIL PROTECTED]
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.
Operating system is Redhat 9.1 for both systems. Both systems have the 2.6.2
with only 1 patch and it is the one Wayne provided for --bwlimit being bi-modal
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