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Too many dropped frames and TxPause frames

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Rahul

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Dec 17, 2009, 4:41:27 PM12/17/09
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I have a situation where I am getting a lot of TxPause Frames. Is this a
cause for worry? What is typically likely to cause this? At the same time
I also see many retransmissions in:

cat /sys/class/infiniband/cxgb3_0/proto_stats/tcpRetransSegs
491998

Just curious whether this is "normal" or a cause for worry? And what's a
good strategy to debug: Switch, OS or eth adapters?

ethtool -S eth0
NIC statistics:
TxOctetsOK : 26828096802
TxFramesOK : 31372373
TxMulticastFramesOK: 6
TxBroadcastFramesOK: 15
TxPauseFrames : 46604
TxUnderrun : 0
TxExtUnderrun : 0
TxFrames64 : 545
TxFrames65To127 : 17386957
TxFrames128To255 : 226439
TxFrames256To511 : 13197
TxFrames512To1023 : 4782225
TxFrames1024To1518 : 7593352
TxFrames1519ToMax : 1369658
RxOctetsOK : 33633096611
RxFramesOK : 34323200
RxMulticastFramesOK: 0
RxBroadcastFramesOK: 60
RxPauseFrames : 0
RxFCSErrors : 0
RxSymbolErrors : 0
RxShortErrors : 0
RxJabberErrors : 0
RxLengthErrors : 0
RxFIFOoverflow : 0
RxFrames64 : 439
RxFrames65To127 : 15628843
RxFrames128To255 : 230941
RxFrames256To511 : 17683
RxFrames512To1023 : 4786452
RxFrames1024To1518 : 12230327
RxFrames1519ToMax : 1428515
PhyFIFOErrors : 0
TSO : 5
VLANextractions : 0
VLANinsertions : 0
TxCsumOffload : 245348
RxCsumGood : 3380530
RxDrops : 0
CheckTXEnToggled : 0
CheckResets : 0
LinkFaults : 0

--
Rahul

lupin492

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Dec 21, 2009, 9:42:07 PM12/21/09
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On Dec 17, 6:41 pm, Rahul <nos...@nospam.invalid> wrote:
> I have a situation where I am getting a lot of TxPause Frames. Is this a
> cause for worry? What is typically likely to cause this? At the same time
> I also see many retransmissions in:
>
>   cat /sys/class/infiniband/cxgb3_0/proto_stats/tcpRetransSegs
> 491998
>
> Just curious whether this is "normal" or a cause for worry? And what's a
> good strategy to debug: Switch, OS or eth adapters?
>
> ethtool -S eth0                          
> NIC statistics:
>      TxOctetsOK         : 26828096802
>      TxFramesOK         : 31372373
>      TxMulticastFramesOK: 6
>      TxBroadcastFramesOK: 15
>      TxPauseFrames      : 46604
>      TxUnderrun         : 0
>      TxExtUnderrun      : 0http://www.techfest.com/networking/lan/ethernet3.htm

Hi! I found an article explaining what are these frames (see section
3.2.1 at http://www.techfest.com/networking/lan/ethernet3.htm ), but
I'm sorry I cannot help you more to debug the problem. I just can
suspect your PC is getting too busy to accept all the frames it
receives from the NIC. Regards,

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