UDP/TCP versus IP frames - subtle out of order packets with hardware hashing

[Adrian Chadd]

On 15 July 2014 07:36, Slawa Olhovchenkov <slw at zxy.spb.ru> wrote:
> On Tue, Jul 15, 2014 at 07:33:57AM -0700, Adrian Chadd wrote:
>
>> On 15 July 2014 04:33, Slawa Olhovchenkov <slw at zxy.spb.ru> wrote:
>> > On Tue, Jul 15, 2014 at 03:22:34PM +0430, Hooman Fazaeli wrote:
>> >
>> >> On 7/15/2014 2:01 PM, Slawa Olhovchenkov wrote:
>> >> > On Tue, Jul 15, 2014 at 01:31:52PM +0430, Hooman Fazaeli wrote:
>> >> >
>> >> >> Doesn't the problem applies to TCP too?
>> >> >> TCP may be fragmented too but is less likely because of MSS.
>> >> > Don't forget GRE, IPIP, ESP and AH!
>> >> >
>> >> These protocols don't use port numbers  and the RSS hash is computed based on the
>> >> (srcip,dstip) tuple, so the problem does not apply to them.
>> >
>> > And all flows go to one queue? Bad.
>>
>> All the packets between two IP addresses for non-TCP, non-UDP get
>> hashed to the same CPU core, yes.
>>
>> If you have 1000 IP tunnels to different end-hosts, they'll be on
>> different CPUs.
>
> What about two host, 10G link and 1000 TCP connections over IPsec?
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