IPSec Performance under Xen

[Sydney Meyer]

Andrey,

with your patch applied the performance drop while using the IPSEC-enabled kernel without doing actual IPSec traffic seems to be gone.

I haven't tested IPSec itself yet, as i had to start from scratch with new VM's but i will set up a IPSec connection and report back.

S.

> On Apr 24, 2015, at 01:26, Andrey V. Elsukov <bu7cher at yandex.ru> wrote:
> 
> On 24.04.2015 01:00, Sydney Meyer wrote:
>> Hello,
>> 
>> I have set up 2 VM's under Xen running each one IPSec-Endpoint.
>> Everything seems to work fine, but (measured with benchmarks/iperf)
>> the performance drops from ~10 Gb/s on a non-IPSec-Kernel to ~200
>> Mb/s with IPSec compiled in, regardless of whether actually using
>> IPSec or not.
> 
> Can you test this patch to see the difference? It isn't a fix. It is
> just to see how will help avoiding of PCB check.
> 
> --- ip_output.c	(revision 281867)
> +++ ip_output.c	(working copy)
> @@ -482,7 +482,7 @@ again:
> 
> sendit:
> #ifdef IPSEC
> -	switch(ip_ipsec_output(&m, inp, &flags, &error)) {
> +	switch(ip_ipsec_output(&m, NULL, &flags, &error)) {
> 	case 1:
> 		goto bad;
> 	case -1:
> 
> 
> -- 
> WBR, Andrey V. Elsukov