netdev - Re: [PATCH v3 net-next 00/11] ipv6: Enable GUEoIPv6 and more fixes for v6 tunneling

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Date:	Fri, 6 May 2016 18:57:59 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	Alexander Duyck <alexander.duyck@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>, Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v3 net-next 00/11] ipv6: Enable GUEoIPv6 and more fixes
 for v6 tunneling

On Fri, May 6, 2016 at 6:09 PM, Alexander Duyck
<alexander.duyck@...il.com> wrote:
> On Fri, May 6, 2016 at 3:11 PM, Tom Herbert <tom@...bertland.com> wrote:
>> This patch set:
>>   - Fixes GRE6 to process translate flags correctly from configuration
>>   - Adds support for GSO and GRO for ip6ip6 and ip4ip6
>>   - Add support for FOU and GUE in IPv6
>>   - Support GRE, ip6ip6 and ip4ip6 over FOU/GUE
>>   - Fixes ip6_input to deal with UDP encapsulations
>>   - Some other minor fixes
>>
>> v2:
>>   - Removed a check of GSO types in MPLS
>>   - Define GSO type SKB_GSO_IPXIP6 and SKB_GSO_IPXIP4 (based on input
>>     from Alexander)
>>   - Don't define GSO types specifally for IP6IP6 and IP4IP6, above
>>     fix makes that uncessary
>>   - Don't bother clearing encapsulation flag in UDP tunnel segment
>>     (another item suggested by Alexander).
>>
>> v3:
>>   - Address some minor comments from Alexander
>>
>> Tested:
>>    Tested a variety of case, but not the full matrix (which is quite
>>    large now). Most of the obivous cases (e.g. GRE) work fine. Still
>>    some issues probably with GSO/GRO being effective in all cases.
>>
>>     - IPv4/GRE/GUE/IPv6 with RCO
>>       1 TCP_STREAM
>>         6616 Mbps
>>       200 TCP_RR
>>         1244043 tps
>>         141/243/446 90/95/99% latencies
>>         86.61% CPU utilization
>>     - IPv6/GRE/GUE/IPv6 with RCO
>>       1 TCP_STREAM
>>         6940 Mbps
>>       200 TCP_RR
>>         1270903 tps
>>         138/236/440 90/95/99% latencies
>>         87.51% CPU utilization
>>
>>      - IP6IP6
>>       1 TCP_STREAM
>>         2576 Mbps
>>       200 TCP_RR
>>         498981 tps
>>         388/498/631 90/95/99% latencies
>>         19.75% CPU utilization (1 CPU saturated)
>>
>>      - IP6IP6/GUE/IPv6 with RCO
>>       1 TCP_STREAM
>>         1854 Mbps
>>       200 TCP_RR
>>         1233818 tps
>>         143/244/451 90/95/99% latencies
>>         87.57 CPU utilization
>>
>>      - IP4IP6
>>       1 TCP_STREAM
>>       200 TCP_RR
>>         763774 tps
>>         250/318/466 90/95/99% latencies
>>         35.25% CPU utilization (1 CPU saturated)
>>
>>      - GRE with keyid
>>       200 TCP_RR
>>         744173 tps
>>         258/332/461 90/95/99% latencies
>>         34.59% CPU utilization (1 CPU saturated)
>
> So I tried testing your patch set and it looks like I cannot get GRE
> working for any netperf test.  If I pop the patches off it is even
> worse since it looks like patch 3 fixes some tunnel flags issues, but
> still doesn't resolve all the issues introduced with b05229f44228
> ("gre6: Cleanup GREv6 transmit path, call common GRE functions").
> Reverting the entire patch seems to resolve the issues, but I will try
> to pick it apart tonight to see if I can find the other issues that
> weren't addressed in this patch series.
>

Can you give details about configuration, test you're running, and HW?

> - Alex