Analyzing dropped packets

[Aviv Greenberg]

What is the server used for? What traffic is comming into the server
(small packets? full MTU?)? at what rate? How many RX descriptors is
your driver set for? Do you have 802.3X flow control enabled (both
ends)? Do you see any abnormal CPU usage when the packet drops occur?

But more fundementally, why are you even concerned with 2916/689587830
packet drops? On most scenarious, this is pretty normal behaviour.

i would be more curious why there are 2900 errors :)

Aviv

On Wed, Mar 11, 2009 at 10:40, Vitaly <linux at karasik.org> wrote:
> 2009/3/11 Michael Green <mishagreen at gmail.com>:
>> Bright minds,
>>
>> I have a brand new server (IBM x3850 M2) that exhibits a problem of
>> dropping packets. Dropped packet are accumulating throughout the day.
>>
>> eth1      Link encap:Ethernet  HWaddr 00:1A:64:DB:E4:26
>>          inet addr:132.77.4.105  Bcast:132.77.5.255  Mask:255.255.254.0
>>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>>          RX packets:689587830 errors:2600 dropped:2916 overruns:0 frame:2600
>>          TX packets:907757124 errors:0 dropped:0 overruns:0 carrier:0
>>          collisions:0 txqueuelen:1000
>>          RX bytes:545358022289 (520093.9 Mb)  TX bytes:1039725325872
>> (991559.3 Mb)
>>          Interrupt:98 Memory:f4000000-f4012100
>>
>> I need your advice on how to approach this problem. What tools/methods
>> are out there to deal with problem like this?
>> I don't have direct access to the switches, even though I can ask our
>> network people to verify/check specific things on their side.
>
>
> I'll start from checking speed settings/status  on both sides.
>
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