https://bugzilla.samba.org/show_bug.cgi?id=9407
Summary: rsync transfers cause zero window packets
Product: rsync
Version: 3.0.9
Platform: All
OS/Version: Linux
Status: NEW
Severity: major
Priority: P5
Component: core
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
I am using BackupPC with rsync daemons running on the target machines. Some
targets are virtual and some are on their own hardware.
A couple of months ago I noticed that one of the VM targets always failed to
get a backup, and upon investigation I found that the packet stream contained
lots of zero window and keep alive packets.
The failure turned out to be caused by a wrong VM network driver on that
particular VM and after resolving that all backups completed. However that
caused me to look into it further when I discovered that fixing the driver did
not stop the zero window packets from happening and upon further investigation
I discovered that ALL backup sessions are seeing lots of zero window packets,
then further investigation shows that backups are taking way too long; as long
as ten hours for a 35GB backup.
I've googled for zero window errors with rsync and nothing I've found points to
anything that could resolve my issue. But how can that be? Am I the only one
seeing this issue? Or is it that no one is looking?
I am running CentOS 6 and Fedora 17, all of which have rsync 3.0.9-1, except
one, which has 3.0.6-9. I have a Gigibit LAN and iperf shows that there is a
solid 900+Mbs throughput in both directions to/from all target machines and the
backup server.
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