I believe my test case is flawed, so I cannot verify with certainty if
the issue is fixed or not. This is the same test case as I used before,
for which I posted code in a gist:
https://gist.github.com/stephank/764e3414d57bc3bcb6b3
Here's what I tried:
- I started two new c3.large machines from
As Stefan Bader mentions in #22, the current workaround is:
sudo ethtool -K eth0 sg off
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https://bugs.launchpad.net/bugs/1317811
Title:
Dropped packets on EC2,
Thanks for the continued help fixing this!
I couldn't reproduce it using redis-benchmark on EC2, but that's okay.
Scatter/gather IO is solely a performance flag in the driver? As in, it
won't affect applications?
The only effect I noticed after disabling it is that it's apparently
required for
I can't comment on the driver implementation details, but I can give
some further details about our experience.
The app in question was a second screen app for the dutch public
broadcasting network for the Eurovision Song Contest. The app was live
for two semi-finals on tuesday the 6th and
So I have a smaller test case. Basically, install Redis (from apt) on
one machine, and Node.js (binaries from nodejs.org) with the below
scripts on the other. Run pub.js once, and sub.js twice, this quickly
triggers the error. The first arg to each script is the address of the
redis machine; I use
For what it's worth, the MTU appears to differ per instance type. At
least c3.large has an MTU of 9000 by default, while m1.small has a
normal MTU of 1500.
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Public bug reported:
Running Ubuntu 14.04 LTS on EC2, we see a lot of the following in the
kernel log:
xen_netfront: xennet: skb rides the rocket: 19 slots
Each of these messages corresponds to a dropped TX packet, and
eventually causes our application's connections to break and timeout.
apport information
** Attachment added: BootDmesg.txt
https://bugs.launchpad.net/bugs/1317811/+attachment/4108532/+files/BootDmesg.txt
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The machine is no longer running, but I can run apport-collect from a
similar machine. The only difference being that we've since added a line
to our startup script to reduce the MTU to 1500.
** Tags added: apport-collected
** Description changed:
Running Ubuntu 14.04 LTS on EC2, we see a lot
apport information
** Attachment added: ProcCpuinfo.txt
https://bugs.launchpad.net/bugs/1317811/+attachment/4108533/+files/ProcCpuinfo.txt
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apport information
** Attachment added: UdevLog.txt
https://bugs.launchpad.net/bugs/1317811/+attachment/4108538/+files/UdevLog.txt
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apport information
** Attachment added: WifiSyslog.txt
https://bugs.launchpad.net/bugs/1317811/+attachment/4108539/+files/WifiSyslog.txt
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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apport information
** Attachment added: ProcInterrupts.txt
https://bugs.launchpad.net/bugs/1317811/+attachment/4108535/+files/ProcInterrupts.txt
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apport information
** Attachment added: ProcEnviron.txt
https://bugs.launchpad.net/bugs/1317811/+attachment/4108534/+files/ProcEnviron.txt
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apport information
** Attachment added: UdevDb.txt
https://bugs.launchpad.net/bugs/1317811/+attachment/4108537/+files/UdevDb.txt
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apport information
** Attachment added: ProcModules.txt
https://bugs.launchpad.net/bugs/1317811/+attachment/4108536/+files/ProcModules.txt
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