netdev - Re: ipsec impact on performance

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 03 Dec 2015 14:33:28 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	sowmini.varadhan@...cle.com
Cc:	netdev@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: ipsec impact on performance

From: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Date: Tue, 1 Dec 2015 12:59:53 -0500

> I instrumented iperf with and without ipsec, just using esp-null, 
> and 1 thread, to keep things simple. I'm seeing some pretty dismal 
> performance numbers with ipsec, and trying to think of ways to
> improve this. Here are my findings, please share feedback.

Doesn't skb_cow_data() contribute significantly to the ESP base cost,
especially for TCP packets?

I mean, we're copying every TCP data frame.

If this is the case, even with GSO/whatever offloads, I expect that
performance will be roughly halfed.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html