On 10/03/2015 09:29 AM, Neal Cardwell wrote:
On Fri, Oct 2, 2015 at 8:21 PM, Ben Greear <gree...@candelatech.com> wrote:
Gah, seems 'cubic' related. That is the default tcp cong ctrl
I was using (same in 3.17, for that matter).
There have been recent changes to CUBIC that may account for this. If
you could repeat your test with more instrumentation, eg "nstat", that
would be very helpful.
nstat > /dev/null
# run one test
nstat
Also, if you could take a sender-side tcpdump trace of the test, that
would be very useful (default capture length, grabbing just headers,
is fine).
Here is nstat output:
[root@ben-ota-1 ~]# nstat
#kernel
IpInReceives 14507 0.0
IpInDelivers 14507 0.0
IpOutRequests 49531 0.0
TcpActiveOpens 3 0.0
TcpPassiveOpens 2 0.0
TcpInSegs 14498 0.0
TcpOutSegs 50269 0.0
UdpInDatagrams 9 0.0
UdpOutDatagrams 1 0.0
TcpExtDelayedACKs 43 0.0
TcpExtDelayedACKLost 5 0.0
TcpExtTCPHPHits 483 0.0
TcpExtTCPPureAcks 918 0.0
TcpExtTCPHPAcks 12758 0.0
TcpExtTCPDSACKOldSent 5 0.0
TcpExtTCPRcvCoalesce 49 0.0
TcpExtTCPAutoCorking 3 0.0
TcpExtTCPOrigDataSent 49776 0.0
TcpExtTCPHystartTrainDetect 1 0.0
TcpExtTCPHystartTrainCwnd 16 0.0
IpExtInBcastPkts 8 0.0
IpExtInOctets 2934274 0.0
IpExtOutOctets 74817312 0.0
IpExtInBcastOctets 640 0.0
IpExtInNoECTPkts 14911 0.0
[root@ben-ota-1 ~]#
And, you can find the pcap here:
http://www.candelatech.com/downloads/cubic.pcap.bz2
Let me know if you need anything else.
Thanks,
Ben
--
Ben Greear <gree...@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
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