BeagleBone slow inbound net I/O

[Brett Wynkoop]

On Fri, 13 Mar 2015 23:02:25 -0700
Tim Kientzle <tim at kientzle.com> wrote:

> 
> > On Mar 11, 2015, at 1:51 PM, Brett Wynkoop <freebsd-arm at wynn.com>
> > wrote:
> > 
> > Have I managed to find a network driver issue?  Any ideas how to
> > gather more information to help get to the bottom of things?
> > 
> 
> $ sysctl dev.cpsw
> 
> This will dump detailed statistics from the Ethernet hardware and
> driver.
> 
> Tim
> 

After a short time while doing nfs i/o


[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 40
dev.cpsw.0.stats.RxAlignErrors: 32
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 40
dev.cpsw.0.stats.RxAlignErrors: 32
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 40
dev.cpsw.0.stats.RxAlignErrors: 32
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 40
dev.cpsw.0.stats.RxAlignErrors: 32
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 40
dev.cpsw.0.stats.RxAlignErrors: 32
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 43
dev.cpsw.0.stats.RxAlignErrors: 32
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 43
dev.cpsw.0.stats.RxAlignErrors: 32
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 54
dev.cpsw.0.stats.RxAlignErrors: 36
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 59
dev.cpsw.0.stats.RxAlignErrors: 40
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 64
dev.cpsw.0.stats.RxAlignErrors: 48
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 66
dev.cpsw.0.stats.RxAlignErrors: 50
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 67
dev.cpsw.0.stats.RxAlignErrors: 53
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 67
dev.cpsw.0.stats.RxAlignErrors: 53
dev.cpsw.0.stats.CarrierSenseErrors: 0

....

[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 172
dev.cpsw.0.stats.RxAlignErrors: 141
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ 

.....
[wynkoop at beaglebone ~]$ sysctl dev.cpsw | grep -i error
dev.cpsw.0.stats.RxCrcErrors: 262
dev.cpsw.0.stats.RxAlignErrors: 231
dev.cpsw.0.stats.CarrierSenseErrors: 0
[wynkoop at beaglebone ~]$ 

So we can see climbing errors.  I am not sure how this compares to the
results of others. The above was during the first few minutes of a
buildworld from an nfs share.

At the same time on the console:

Mar 14 03:07:47 beaglebone amd[1163]: mountd rpc failed: RPC: Can't
decode result Mar 14 03:11:48 beaglebone amd[1399]: mountd rpc failed:
RPC: Can't decode result

which makes sense with the above errors I think.

-Brett

-- 

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