netdev - [net-next PATCH 0/2] Prevent packet reordering on tap/tun interfaces

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-next>] [day] [month] [year] [list]

Message-ID: <20160602010741.9319.56926.stgit@localhost.localdomain>
Date:	Wed, 01 Jun 2016 18:17:11 -0700
From:	Alexander Duyck <aduyck@...antis.com>
To:	netdev@...r.kernel.org, davem@...emloft.net,
	alexander.duyck@...il.com
Subject: [net-next PATCH 0/2] Prevent packet reordering on tap/tun interfaces

This patch set is meant to address a recent issue I found with VMs sending
traffic across a network.  Specifically what I found was that the tap
interfaces were spreading single flows across all CPUs on the system due
to the fact that the sending VM was being load balanced across them.  Under
light load this doesn't have much of an impact, however under heavier loads
where the interfaces are already running with Rx cleanup from other flows
on the CPUs I have seen this have a fairly significant impact as we can
avoid any issues due to reordering.  The results can be anywhere from 10 to
30% improvement from what I have seen.

---

Alexander Duyck (2):
      net: Add function to allow configuration of RPS
      tun: Configure Rx queues to default to RPS enabled

 drivers/net/tun.c         |    4 +++-
 include/linux/netdevice.h |    9 ++++++++
 net/core/dev.c            |   51 ++++++++++++++++++++++++++++++++++++++++++++-
 net/core/net-sysfs.c      |   45 +++++++---------------------------------
 4 files changed, 70 insertions(+), 39 deletions(-)

--