netdev - Re: ipsec impact on performance

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Message-ID: <565DEBF7.7040304@hpe.com>
Date:	Tue, 1 Dec 2015 10:50:31 -0800
From:	Rick Jones <rick.jones2@....com>
To:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:	netdev@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: ipsec impact on performance

On 12/01/2015 10:45 AM, Sowmini Varadhan wrote:
> On (12/01/15 10:17), Rick Jones wrote:
>>
>> What do the perf profiles show?  Presumably, loss of TSO/GSO means
>> an increase in the per-packet costs, but if the ipsec path
>> significantly increases the per-byte costs...
>
> For ESP-null, there's actually very little work to do - we just
> need to add the 8 byte ESP header with an spi and a seq#.. no
> crypto work to do.. so the overhead *should* be minimal, else
> we've painted ourself into a corner where we can't touch anything
> including TCP options like md5.

Something of a longshot, but are you sure you are still getting 
effective CKO/GRO on the receiver?

rick jones
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