From: Rusty Russell <rusty@rustcorp.com.au>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH 02/16] virtio_ring: virtqueue_add_sgs, to add multiple sgs.
Date: Fri, 01 Mar 2013 11:31:40 +1030 [thread overview]
Message-ID: <877glsc4qz.fsf@rustcorp.com.au> (raw)
In-Reply-To: <512F223B.4080801@redhat.com>
Paolo Bonzini <pbonzini@redhat.com> writes:
> Il 27/02/2013 12:21, Rusty Russell ha scritto:
>>>> >> Baseline (before add_sgs):
>>>> >> 2.840000-3.040000(2.927292)user
>>>> >>
>>>> >> After add_sgs:
>>>> >> 2.970000-3.150000(3.053750)user
>>>> >>
>>>> >> After simplifying add_buf a little:
>>>> >> 2.950000-3.210000(3.081458)user
>>>> >>
>>>> >> After inlining virtqueue_add/vring_add_indirect:
>>>> >> 2.920000-3.150000(3.026875)user
>>>> >>
>>>> >> After passing in iteration functions (chained vs unchained):
>>>> >> 2.760000-2.970000(2.883542)user
>> Oops. This result (and the next) is bogus. I was playing with -O3, and
>> accidentally left that in :(
>
> Did you check what actually happened that improved speed so much?
No, it was a random aside, I didn't dig into it. Perhaps we should
revisit using -O3 on the entire kernel, or perhaps grab gcc 3.8 and see
how that performs.
But I'm implementing specialized virtqueue_add_outbuf() and
virtqueue_add_inbuf() which seem to get more improvement anyway (except
occasionally I get hangs in my tests, which I'm debugging now...)
Cheers,
Rusty.
next prev parent reply other threads:[~2013-03-03 22:15 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-19 7:56 [PATCH 00/16] virtio ring rework Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-19 7:56 ` [PATCH 01/16] scatterlist: introduce sg_unmark_end Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-19 7:56 ` [PATCH 02/16] virtio_ring: virtqueue_add_sgs, to add multiple sgs Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-19 9:15 ` Wanlong Gao
2013-02-19 9:15 ` Wanlong Gao
2013-02-20 9:18 ` Asias He
2013-02-20 9:18 ` Asias He
2013-02-24 22:12 ` Michael S. Tsirkin
2013-02-24 22:12 ` Michael S. Tsirkin
2013-02-26 5:14 ` Rusty Russell
2013-02-26 5:14 ` Rusty Russell
2013-02-26 9:30 ` Michael S. Tsirkin
2013-02-26 9:30 ` Michael S. Tsirkin
2013-02-26 7:02 ` Paolo Bonzini
2013-02-26 7:02 ` Paolo Bonzini
2013-02-27 7:28 ` Rusty Russell
2013-02-27 7:49 ` Michael S. Tsirkin
2013-02-27 11:21 ` Rusty Russell
2013-02-27 11:21 ` Rusty Russell
2013-02-28 9:24 ` Paolo Bonzini
2013-02-28 9:24 ` Paolo Bonzini
2013-03-01 1:01 ` Rusty Russell [this message]
2013-03-01 1:01 ` Rusty Russell
2013-02-19 7:56 ` [PATCH 03/16] virtio-blk: reorganize virtblk_add_req Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-19 7:56 ` [PATCH 04/16] virtio-blk: use virtqueue_start_buf on bio path Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-20 9:19 ` Asias He
2013-02-20 9:19 ` Asias He
2013-02-21 6:23 ` Rusty Russell
2013-02-21 6:23 ` Rusty Russell
2013-02-19 7:56 ` [PATCH 05/16] virtio-blk: use virtqueue_add_sgs on req path Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-20 9:20 ` Asias He
2013-02-20 9:20 ` Asias He
2013-02-19 7:56 ` [PATCH 06/16] virtio_blk: remove nents member Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-20 9:20 ` Asias He
2013-02-20 9:20 ` Asias He
2013-02-19 7:56 ` [PATCH 07/16] virtio_ring: don't count elements twice for add_buf path Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-20 10:09 ` Wanlong Gao
2013-02-20 10:09 ` Wanlong Gao
2013-02-19 7:56 ` [PATCH 08/16] virtio_ring: virtqueue_add_outbuf / virtqueue_add_inbuf Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-20 10:09 ` Wanlong Gao
2013-02-20 10:09 ` Wanlong Gao
2013-02-21 17:09 ` Michael S. Tsirkin
2013-02-21 17:09 ` Michael S. Tsirkin
2013-02-22 0:02 ` Rusty Russell
2013-02-22 0:02 ` Rusty Russell
2013-02-25 21:35 ` Michael S. Tsirkin
2013-02-25 21:35 ` Michael S. Tsirkin
2013-02-28 5:08 ` Rusty Russell
2013-02-28 5:08 ` Rusty Russell
2013-02-28 7:01 ` Michael S. Tsirkin
2013-02-28 7:01 ` Michael S. Tsirkin
2013-03-06 6:03 ` Rusty Russell
2013-03-06 6:03 ` Rusty Russell
2013-02-19 7:56 ` [PATCH 09/16] virtio_net: use simplified virtqueue accessors Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-20 10:09 ` Wanlong Gao
2013-02-20 10:09 ` Wanlong Gao
2013-02-19 7:56 ` [PATCH 10/16] virtio_net: use virtqueue_add_sgs[] for command buffers Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-20 10:11 ` Wanlong Gao
2013-02-20 10:11 ` Wanlong Gao
2013-02-21 6:27 ` Rusty Russell
2013-02-21 6:27 ` Rusty Russell
2013-02-21 8:30 ` Wanlong Gao
2013-02-21 8:30 ` Wanlong Gao
2013-02-21 9:41 ` Jason Wang
2013-02-21 9:41 ` Jason Wang
2013-02-21 9:43 ` Wanlong Gao
2013-02-21 9:43 ` Wanlong Gao
2013-02-19 7:56 ` [PATCH 11/16] virtio_rng: use simplified virtqueue accessors Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-20 10:12 ` Wanlong Gao
2013-02-20 10:12 ` Wanlong Gao
2013-02-19 7:56 ` [PATCH 12/16] virtio_console: " Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-20 10:12 ` Wanlong Gao
2013-02-20 10:12 ` Wanlong Gao
2013-02-19 7:56 ` [PATCH 13/16] caif_virtio: " Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-20 10:13 ` Wanlong Gao
2013-02-20 10:13 ` Wanlong Gao
2013-02-19 7:56 ` [PATCH 14/16] virtio_rpmsg_bus: " Rusty Russell
2013-02-20 10:14 ` Wanlong Gao
2013-02-20 10:14 ` Wanlong Gao
2013-02-19 7:56 ` Rusty Russell
2013-02-19 7:56 ` [PATCH 15/16] virtio_balloon: " Rusty Russell
2013-02-20 10:15 ` Wanlong Gao
2013-02-20 10:15 ` Wanlong Gao
2013-02-19 7:56 ` Rusty Russell
2013-02-19 7:56 ` [PATCH 16/16] 9p/trans_virtio.c: use virtio_add_sgs[] Rusty Russell
2013-02-19 7:56 ` Rusty Russell
2013-02-19 9:15 ` [PATCH 00/16] virtio ring rework Paolo Bonzini
2013-02-19 9:15 ` Paolo Bonzini
2013-02-21 6:30 ` Rusty Russell
2013-02-21 6:30 ` Rusty Russell
2013-02-20 8:37 ` [PATCH 17/16] virtio-scsi: use virtqueue_add_sgs for command buffers Wanlong Gao
2013-02-20 8:37 ` Wanlong Gao
2013-02-20 9:38 ` Asias He
2013-02-20 9:38 ` Asias He
2013-02-20 9:41 ` Wanlong Gao
2013-02-20 9:41 ` Wanlong Gao
2013-02-20 9:47 ` [PATCH 17/16 V2] " Wanlong Gao
2013-02-20 9:47 ` Wanlong Gao
2013-02-20 10:54 ` Paolo Bonzini
2013-02-20 10:54 ` Paolo Bonzini
2013-02-20 12:17 ` Asias He
2013-02-20 12:17 ` Asias He
2013-02-21 6:34 ` Rusty Russell
2013-02-21 6:34 ` Rusty Russell
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