Re: [E1000-devel] Performance deterioration under load - 82599EB

[Tantilov, E. S <emi...@in...>]

>-----Original Message-----
>From: Sanjay Rao [mailto:sr...@ve...]
>Sent: Thursday, March 24, 2011 2:56 PM
>To: Tantilov, Emil S
>Cc: e10...@li...
>Subject: Re: Performance deterioration under load - 82599EB
>
>
>>> Under load, doing a ifconfig ethX down and up brings down the
>performance
>>> of
>>> the NIC to 1/1000th of the initial number.
>>>
>>>
>> Could you provide more detail about the type of traffic you were running?
>>
>> After the reset is the interface operational at all - i.e. is the
>performance degradation the only problem you are seeing? We have a known
>bug which we're working on that under similar test (resets while passing
>traffic) will cause the device to hang on Rx.
>>
>> Thanks,
>> Emil
>
>I am using pktgen to generate 8mil pps (65 bytes pkts udp). I have two 10g
>interfaces eth6&  eth5. It is a simple forwarding test with  packets coming
>in on eth6 and sent out on eth5. Source and destination configuration of
>pktgen is as below:
>
>
>pgset "src_min 100.0.0.1"
>
>pgset "src_max 100.254.254.254"
>
>pgset "dst 192.168.3.136"
>
>pgset "pkt_size 64"
>
>
>
>I am running RHEL6 kernel on a DELL 610 server. Missed packets are
>accounted by "rx_missed_errors". Performance degradation is the only thing
>I am seeing so far. Interface is responsive otherwise. It seems like a
>problem with only rx side as tx works fine in this state as well. Let me
>know if you need further info.
>
>
>
>IRQ assignment is as below:
>
>
>
>--- eth6 ---
>
>IRQ  103  100
>
>IRQ  104  200
>
>IRQ  105  400
>
>IRQ  106  800
>
>IRQ  107  1000
>
>IRQ  108  2000
>
>IRQ  109  4000
>
>IRQ  110  8000
>
>IRQ  111  10000
>
>IRQ  112  20000
>
>IRQ  113  40000
>
>IRQ  114  80000
>
>IRQ  115  100000
>
>IRQ  116  200000
>
>IRQ  117  400000
>
>IRQ  118  800000
>
>IRQ  119  1
>
>IRQ  120  2
>
>IRQ  121  4
>
>IRQ  122  8
>
>IRQ  123  10
>
>IRQ  124  20
>
>IRQ  125  40
>
>IRQ  126  80
>
>
>
>--- eth5 ---
>
>IRQ  128  100
>
>IRQ  129  200
>
>IRQ  130  400
>
>IRQ  131  800
>
>IRQ  132  1000
>
>IRQ  133  2000
>
>IRQ  134  4000
>
>IRQ  135  8000
>
>IRQ  136  10000
>
>IRQ  137  20000
>
>IRQ  138  40000
>
>IRQ  139  80000
>
>IRQ  140  100000
>
>IRQ  141  200000
>
>IRQ  142  400000
>
>IRQ  143  800000
>
>IRQ  144  1
>
>IRQ  145  2
>
>IRQ  146  4
>
>IRQ  147  8
>
>IRQ  148  10
>
>IRQ  149  20
>
>IRQ  150  40
>
>IRQ  151  80
>
>
>Thanks
>
>Sanjay
>

Sanjay,

Thanks for the additional details. We attempted a quick repro, but were unable to reproduce the performance drop you described.

I think it's best if you submit a bug at e1000.sf.net and include all the details from this email. Also please add the output of dmesg, lspci -vvv, ethtool -d and ethtool -e from the interface under test.

Thanks,
Emil