Hi,
this is an issue in Copr:
  https://bugzilla.redhat.com/show_bug.cgi?id=1268192
this happen rarely, but this is not first report. So I should address it 
somehow.

Google say:
  
http://serverfault.com/questions/338439/ssh-sessions-terminate-abruptly-with-message-corrupted-mac-on-input-disconnect
  
https://ask.openstack.org/en/question/25306/slow-network-speed-between-vm-and-external/

I hesitate to turn off checksumming, but switching TCP segmentation offload off 
gains some improvements.
During several measurements I see gain from 15.2 sec to 14.6 sec (when 
transferring Fedora ISO).
But I was unable to reproduce the packet corruption.

The question is - should I disable TCO on Copr machines only, or should I 
disable it in general VM spinup playbook for
all our VM?

And this wiki:
  https://www.rdoproject.org/Using_GRE_tenant_networks#Offloading
suggest to turn it off for physical hosts too. Not sure why.

I welcome your comments

  Mirek





-------- Přeposlaná zpráva --------
Předmět: [Bug 1268192] New: Rsync fails with "Corrupted MAC on input. 
Disconnecting: Packet corrupt"
Datum: Fri, 02 Oct 2015 05:27:49 +0000
Od: [email protected]
Komu: [email protected]

https://bugzilla.redhat.com/show_bug.cgi?id=1268192

            Bug ID: 1268192
           Summary: Rsync fails with "Corrupted MAC on input.
                    Disconnecting: Packet corrupt"
           Product: Copr
         Component: backend
          Assignee: [email protected]
          Reporter: [email protected]



Description of problem:
copr builds are building successfully, but the final rsync fails with an error
message.

Version-Release number of selected component (if applicable):


How reproducible:
Random, occurred twice on Fedora Rawhide, once on EPEL 7, but I only did 5
builds.

Steps to Reproduce:
1. Start a copr build, possibly only on EPEL7/Fedora Rawhide
2. Wait
3. Build might be marked as failed despite rpm packages being in the fold
afterwards.

Actual results:
Some copr builds fail inexplicably in the middle of an rsync job.

Expected results:
Rsync is successful

Additional info:
Affected builds:
https://copr-be.cloud.fedoraproject.org/results/kyl191/nginx-pagespeed/fedora-rawhide-x86_64/00122195-nginx-pagespeed/build-00122195.rsync.log

https://copr-be.cloud.fedoraproject.org/results/kyl191/nginx-pagespeed/epel-7-x86_64/00122218-nginx-pagespeed/build-00122218.rsync.log

https://copr-be.cloud.fedoraproject.org/results/kyl191/nginx-pagespeed/fedora-rawhide-i386/00122219-nginx-pagespeed/build-00122219.rsync.log

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