linux-kernel - [PATCH 0/3] ringtest: performance optimization

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Message-Id: <1475746752-17454-1-git-send-email-pbonzini@redhat.com>
Date:   Thu,  6 Oct 2016 11:39:09 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     mst@...hat.com
Subject: [PATCH 0/3] ringtest: performance optimization

In order to provide more reliable results, use link-time
optimization to inline the ring implementation in the guest/host
threads.  The second and third patch then are a reimplementation of
https://marc.info/?l=kvm&m=147428514903134&w=2 for all ring structures,
saving on code size by removing separate implementations of poll_avail
and poll_used.

Here are the results of the benchmarks:

	0_9		inorder		poll		new
base    0m10.019s       0m8.001s        0m8.724s        0m7.991s
LTO     0m8.063s        0m6.636s        0m7.106s        0m7.201s
havebuf 0m7.969s        0m6.601s        0m7.097s        0m7.054s


Paolo Bonzini (3):
  ringtest: use link-time optimization
  ringtest: commonize implementation of poll_avail/poll_used
  ringtest: poll for new buffers once before updating event index

 tools/virtio/ringtest/Makefile          |  4 +--
 tools/virtio/ringtest/main.c            | 20 ++++++++---
 tools/virtio/ringtest/main.h            |  4 +--
 tools/virtio/ringtest/noring.c          |  6 ++--
 tools/virtio/ringtest/ptr_ring.c        | 22 +++---------
 tools/virtio/ringtest/ring.c            | 18 ++++------
 tools/virtio/ringtest/virtio_ring_0_9.c | 64 ++++++++-------------------------
 7 files changed, 49 insertions(+), 89 deletions(-)

-- 
2.7.4