On Monday 31 August 2009 6:18:56 am Andrew Brampton wrote:
> Hi FreeBSD-Hackers,
>
> netstat -i will print out statistics for each interface, including
> input/output packets, input/output bytes, and input/output errors. Now
> packets and bytes columns seem to be absolute counts, whereas the
> errors column seems to be a count over the last second. For example,
> when I am filling a link (and then stop), I get output like so:
>
> Name Mtu Network Address Ipkts Ierrs Opkts Oerrs
Coll
> ix0 9000 <Link#4> 00:1b:21:20:f9:07 12687951213 432913
> 1 0 0
> <wait a second>
> ix0 9000 <Link#4> 00:1b:21:20:f9:07 12691545431 435439
> 1 0 0
> <wait a second>
> ix0 9000 <Link#4> 00:1b:21:20:f9:07 12692054413 434735
> 1 0 0
> <wait a second and traffic has stopped>
> ix0 9000 <Link#4> 00:1b:21:20:f9:07 12696499228 300785
> 1 0 0
> <wait a second>
> ix0 9000 <Link#4> 00:1b:21:20:f9:07 12696499228 0 1
> 0 0
>
> As you can see the "Ipkts" value continues to rise, but the "Ierrs"
> goes up and down, eventually falling to zero. So my question is,
> should this "Ierrs" count be per second?, if so how can I change this
> behaviour. I looked at the source code for the driver (ixgbe) and the
> OS, looking for every reference to ifp->if_ierrors, but I didn't find
> anything that reset this value over time. I also tried a similar
> experiment with the e1000 driver but I couldn't get that interface to
> list any errors.
>
> I'm running these tests on FreeBSD 8.0-Beta3, but I observed the same
> behaviour on FreeBSD 7.2.
It should be total and it sounds like a bug in the device driver. It looks
like ixgbe_update_stats_counters() overwrites the accumulated value of
if_ierrors:
/* Rx Errors */
ifp->if_ierrors = total_missed_rx + adapter->stats.crcerrs +
adapter->stats.rlec;
It also increments if_ierrors in ixgbe_rxeof(). The driver should only do one
or the other, but probably not both.
--
John Baldwin
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