From: Jason Wang <jasowang@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, virtualization@lists.linux-foundation.org
Subject: Re: [PATCH net-next V4 5/5] vhost: access vq metadata through kernel virtual address
Date: Fri, 25 Jan 2019 17:16:32 +0800 [thread overview]
Message-ID: <18e64692-2598-6e95-3b93-c34528d04c1b__45266.1625736923$1548442063$gmane$org@redhat.com> (raw)
In-Reply-To: <20190124215912-mutt-send-email-mst@kernel.org>
On 2019/1/25 上午11:00, Michael S. Tsirkin wrote:
> On Thu, Jan 24, 2019 at 12:07:54PM +0800, Jason Wang wrote:
>>> Meanwhile, could you pls post data comparing this last patch with the
>>> below? This removes the speculation barrier replacing it with a
>>> (useless but at least more lightweight) data dependency.
>> SMAP off
>>
>> Your patch: 7.2MPPs
>>
>> vmap: 7.4Mpps
> OK so while we keep looking into vmap, why don't we merge something like
> the below? Seems quite straight forward ...
>
The problem is it gives ~8% regression on PPS when SMAP is on. This is
probably because the latency of lfence is hided by previous stac as
mentioned in the commit b3bbfb3fb5d25776b8e3f361d2eedaabb0b496cd.
Thanks
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next prev parent reply other threads:[~2019-01-25 9:16 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-23 9:55 [PATCH net-next V4 0/5] vhost: accelerate metadata access through vmap() Jason Wang
2019-01-23 9:55 ` [PATCH net-next V4 1/5] vhost: generalize adding used elem Jason Wang
2019-01-23 9:55 ` Jason Wang
2019-01-23 9:55 ` [PATCH net-next V4 2/5] vhost: fine grain userspace memory accessors Jason Wang
2019-01-23 9:55 ` Jason Wang
2019-01-23 9:55 ` [PATCH net-next V4 3/5] vhost: rename vq_iotlb_prefetch() to vq_meta_prefetch() Jason Wang
2019-01-23 9:55 ` Jason Wang
2019-01-23 9:55 ` [PATCH net-next V4 4/5] vhost: introduce helpers to get the size of metadata area Jason Wang
2019-01-23 9:55 ` Jason Wang
2019-01-23 9:55 ` [PATCH net-next V4 5/5] vhost: access vq metadata through kernel virtual address Jason Wang
2019-01-23 9:55 ` Jason Wang
2019-01-23 14:08 ` Michael S. Tsirkin
2019-01-24 4:07 ` Jason Wang
2019-01-24 4:07 ` Jason Wang
2019-01-24 4:11 ` Jason Wang
2019-01-24 4:11 ` Jason Wang
2019-01-24 4:53 ` Michael S. Tsirkin
2019-01-24 4:53 ` Michael S. Tsirkin
2019-01-25 2:33 ` Jason Wang
2019-01-25 2:33 ` Jason Wang
2019-01-24 4:51 ` Michael S. Tsirkin
2019-01-24 4:51 ` Michael S. Tsirkin
2019-01-25 3:00 ` Michael S. Tsirkin
2019-01-25 3:00 ` Michael S. Tsirkin
2019-01-25 9:16 ` Jason Wang
2019-01-25 9:16 ` Jason Wang [this message]
2019-01-23 14:08 ` Michael S. Tsirkin
2019-01-25 3:03 ` Michael S. Tsirkin
2019-01-25 3:03 ` Michael S. Tsirkin
2019-01-25 9:21 ` Jason Wang
2019-01-25 9:21 ` Jason Wang
2019-01-25 9:24 ` Jason Wang
2019-01-25 9:24 ` Jason Wang
2019-01-23 13:58 ` [PATCH net-next V4 0/5] vhost: accelerate metadata access through vmap() Michael S. Tsirkin
2019-01-23 13:58 ` Michael S. Tsirkin
2019-01-23 17:24 ` David Miller
2019-01-23 17:24 ` David Miller
2019-01-26 22:37 ` David Miller
2019-01-26 22:37 ` David Miller
2019-01-27 0:31 ` Michael S. Tsirkin
2019-01-27 0:31 ` Michael S. Tsirkin
2019-01-29 2:34 ` Jason Wang
2019-01-29 2:34 ` Jason Wang
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