Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2: smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped

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From	Vagrant Cascadian <vagrant@debian.org>
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Subject	Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2: smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped
Date	Mon, 02 May 2016 03:30:01 +0200
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Control: tag 820622 -moreinfo

On 2016-04-28, Ben Hutchings wrote:

> Could you test with turbo_mode re-enabled and with this patch applied?
>
> Also could you test network receive throughput (e.g. with netperf -t
> TCP_STREAM, sending *to* the RPi) in these three different
> configurations:

Ok, if I understood you correctly...

Installed netperf on another machine, and ran:

  netperf -t TCP_STREAM 10.0.0.50

Where 10.0.0.50 is the raspberry pi 2.

Ran netperf twice for each combination, rebooting the raspberry pi 2
between changes in turbo_mode or kernel. Double-checked
/sys/module/smsc95xx/parameters/turbo_mode contained N when booted with
turbo_mode=0, and Y when turbo_mode=1.

To my untrained eye, doesn't look like a significant difference between
any of the modes. None of them triggered the kernel messages that
prompted the bug report.

> 1. turbo_mode=0

  MIGRATED TCP STREAM TEST from 0.0.0.0 () port 0 AF_INET to localhost () port 0 AF_INET : demo
  Recv   Send    Send
  Socket Socket  Message  Elapsed
  Size   Size    Size     Time     Throughput
  bytes  bytes   bytes    secs.    10^6bits/sec

   87380  16384  16384    10.02    1781.22

  MIGRATED TCP STREAM TEST from 0.0.0.0 () port 0 AF_INET to localhost () port 0 AF_INET : demo
  Recv   Send    Send
  Socket Socket  Message  Elapsed
  Size   Size    Size     Time     Throughput
  bytes  bytes   bytes    secs.    10^6bits/sec

   87380  16384  16384    10.02    1847.21

> 2. turbo_mode=1, current driver

  MIGRATED TCP STREAM TEST from 0.0.0.0 () port 0 AF_INET to localhost () port 0 AF_INET : demo
  Recv   Send    Send                          
  Socket Socket  Message  Elapsed              
  Size   Size    Size     Time     Throughput  
  bytes  bytes   bytes    secs.    10^6bits/sec  

   87380  16384  16384    10.02    1812.38   
  MIGRATED TCP STREAM TEST from 0.0.0.0 () port 0 AF_INET to localhost () port 0 AF_INET : demo
  Recv   Send    Send                          
  Socket Socket  Message  Elapsed              
  Size   Size    Size     Time     Throughput  
  bytes  bytes   bytes    secs.    10^6bits/sec  

   87380  16384  16384    10.02    1843.34   

> 3. turbo_mode=1, patched driver

  MIGRATED TCP STREAM TEST from 0.0.0.0 () port 0 AF_INET to localhost () port 0 AF_INET : demo
  Recv   Send    Send                          
  Socket Socket  Message  Elapsed              
  Size   Size    Size     Time     Throughput  
  bytes  bytes   bytes    secs.    10^6bits/sec  

   87380  16384  16384    10.03    1822.99   
  MIGRATED TCP STREAM TEST from 0.0.0.0 () port 0 AF_INET to localhost () port 0 AF_INET : demo
  Recv   Send    Send                          
  Socket Socket  Message  Elapsed              
  Size   Size    Size     Time     Throughput  
  bytes  bytes   bytes    secs.    10^6bits/sec  

   87380  16384  16384    10.03    1824.52   

live well,
  vagrant

Thread

Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2: smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Vagrant Cascadian <vagrant@debian.org> - 2016-04-10 20:20 +0200
  Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2: smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Ben Hutchings <ben@decadent.org.uk> - 2016-04-10 21:20 +0200
    Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2: smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Vagrant Cascadian <vagrant@debian.org> - 2016-04-10 22:30 +0200
    Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Diederik de Haas <didi.debian@cknow.org> - 2016-04-10 23:00 +0200
      Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Ben Hutchings <ben@decadent.org.uk> - 2016-04-11 02:20 +0200
        Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Vagrant Cascadian <vagrant@debian.org> - 2016-04-11 03:10 +0200
          Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Vagrant Cascadian <vagrant@debian.org> - 2016-04-11 17:20 +0200
          Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Vagrant Cascadian <vagrant@debian.org> - 2016-04-13 20:50 +0200
            Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Ben Hutchings <ben@decadent.org.uk> - 2016-04-28 17:20 +0200
              Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Diederik de Haas <didi.debian@cknow.org> - 2016-04-28 17:40 +0200
                Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Ben Hutchings <ben@decadent.org.uk> - 2016-04-28 18:20 +0200
              Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Vagrant Cascadian <vagrant@debian.org> - 2016-05-02 03:30 +0200
                Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Ben Hutchings <ben@decadent.org.uk> - 2016-05-02 21:00 +0200
                Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Vagrant Cascadian <vagrant@debian.org> - 2016-05-03 06:10 +0200
                Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Vagrant Cascadian <vagrant@debian.org> - 2016-05-03 18:20 +0200
                Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Ben Hutchings <ben@decadent.org.uk> - 2016-05-07 13:50 +0200
                Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Diederik de Haas <didi.debian@cknow.org> - 2016-05-07 14:10 +0200
  Processed: Re: Bug#820622: linux-image-4.5.0-trunk-armmp-lpae:  raspberry pi 2: smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped owner@bugs.debian.org (Debian Bug Tracking System) - 2016-04-10 21:20 +0200
  Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2: smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Bjørn Mork <bjorn@mork.no> - 2016-04-11 10:20 +0200
    Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2: smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Ben Hutchings <ben@decadent.org.uk> - 2016-04-11 13:30 +0200
      Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2: smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped Bjørn Mork <bjorn@mork.no> - 2016-04-11 15:10 +0200
  Processed: Re: Bug#820622: linux-image-4.5.0-trunk-armmp-lpae:  raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped owner@bugs.debian.org (Debian Bug Tracking System) - 2016-04-28 17:20 +0200
  Processed: Re: Bug#820622: linux-image-4.5.0-trunk-armmp-lpae:  raspberry pi 2:  smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped owner@bugs.debian.org (Debian Bug Tracking System) - 2016-05-02 03:30 +0200

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