dpdk.org; qemu-
> devel at nongnu.org
> Subject: Re: [dpdk-dev] [Qemu-devel] [PATCH 1/2] vhost: enable any layout
> feature
>
> On Tue, Oct 11, 2016 at 02:57:49PM +0800, Yuanhan Liu wrote:
> > > > > > > There was an example: the vhost enqueue optmization
On Tue, Oct 11, 2016 at 02:57:49PM +0800, Yuanhan Liu wrote:
> > > > > > There was an example: the vhost enqueue optmization patchset from
> > > > > > Zhihong [0] uses memset, and it introduces more than 15% drop (IIRC)
Though it doesn't matter now, but I have verified it yesterday (with and
wihto
On Mon, Oct 10, 2016 at 07:39:59AM +0300, Michael S. Tsirkin wrote:
> > > > > > 1. why is this memset expensive?
> > > > >
> > > > > I don't have the exact answer, but just some rough thoughts:
> > > > >
> > > > > It's an external clib function: there is a call stack and the
> > > > > IP register w
On Tue, Oct 11, 2016 at 08:39:54AM +0200, Maxime Coquelin wrote:
>
>
> On 10/11/2016 08:04 AM, Yuanhan Liu wrote:
> >On Mon, Oct 10, 2016 at 04:54:39PM +0200, Maxime Coquelin wrote:
> >>
> >>
> >>On 10/10/2016 04:42 PM, Yuanhan Liu wrote:
> >>>On Mon, Oct 10, 2016 at 02:40:44PM +0200, Maxime Coqu
On Mon, Oct 10, 2016 at 04:54:39PM +0200, Maxime Coquelin wrote:
>
>
> On 10/10/2016 04:42 PM, Yuanhan Liu wrote:
> >On Mon, Oct 10, 2016 at 02:40:44PM +0200, Maxime Coquelin wrote:
> >At that time, a packet always use 2 descs. Since indirect desc is
> >enabled (by default) now, the assum
On 10/11/2016 08:04 AM, Yuanhan Liu wrote:
> On Mon, Oct 10, 2016 at 04:54:39PM +0200, Maxime Coquelin wrote:
>>
>>
>> On 10/10/2016 04:42 PM, Yuanhan Liu wrote:
>>> On Mon, Oct 10, 2016 at 02:40:44PM +0200, Maxime Coquelin wrote:
>>> At that time, a packet always use 2 descs. Since indirect
On Mon, Oct 10, 2016 at 02:40:44PM +0200, Maxime Coquelin wrote:
> >>>At that time, a packet always use 2 descs. Since indirect desc is
> >>>enabled (by default) now, the assumption is not true then. What's
> >>>worse, it might even slow things a bit down. That should also be
> >>>part of the reaso
On 10/10/2016 04:42 PM, Yuanhan Liu wrote:
> On Mon, Oct 10, 2016 at 02:40:44PM +0200, Maxime Coquelin wrote:
> At that time, a packet always use 2 descs. Since indirect desc is
> enabled (by default) now, the assumption is not true then. What's
> worse, it might even slow things a bi
On 10/10/2016 06:22 AM, Yuanhan Liu wrote:
> On Mon, Oct 10, 2016 at 07:17:06AM +0300, Michael S. Tsirkin wrote:
>> On Mon, Oct 10, 2016 at 12:05:31PM +0800, Yuanhan Liu wrote:
>>> On Fri, Sep 30, 2016 at 10:16:43PM +0300, Michael S. Tsirkin wrote:
>> And the same is done is done in DPDK:
>>>
On Mon, Oct 10, 2016 at 07:17:06AM +0300, Michael S. Tsirkin wrote:
> On Mon, Oct 10, 2016 at 12:05:31PM +0800, Yuanhan Liu wrote:
> > On Fri, Sep 30, 2016 at 10:16:43PM +0300, Michael S. Tsirkin wrote:
> > > > > And the same is done is done in DPDK:
> > > > >
> > > > > static inline int __attribu
On Fri, Sep 30, 2016 at 10:16:43PM +0300, Michael S. Tsirkin wrote:
> > > And the same is done is done in DPDK:
> > >
> > > static inline int __attribute__((always_inline))
> > > copy_desc_to_mbuf(struct virtio_net *dev, struct vring_desc *descs,
> > > uint16_t max_desc, struct rte_mbuf
On Mon, Oct 10, 2016 at 06:46:44AM +0300, Michael S. Tsirkin wrote:
> On Mon, Oct 10, 2016 at 11:37:44AM +0800, Yuanhan Liu wrote:
> > On Thu, Sep 29, 2016 at 11:21:48PM +0300, Michael S. Tsirkin wrote:
> > > On Thu, Sep 29, 2016 at 10:05:22PM +0200, Maxime Coquelin wrote:
> > > >
> > > >
> > > >
On Thu, Sep 29, 2016 at 10:05:22PM +0200, Maxime Coquelin wrote:
> >so doing this unconditionally would be a spec violation, but if you see
> >value in this, we can add a feature bit.
> Right it would be a spec violation, so it should be done conditionally.
> If a feature bit is to be added, what a
On Thu, Sep 29, 2016 at 11:21:48PM +0300, Michael S. Tsirkin wrote:
> On Thu, Sep 29, 2016 at 10:05:22PM +0200, Maxime Coquelin wrote:
> >
> >
> > On 09/29/2016 07:57 PM, Michael S. Tsirkin wrote:
> Yes but two points.
>
> 1. why is this memset expensive?
I don't have the exact answer, but just
On Mon, Oct 10, 2016 at 04:16:19AM +, Wang, Zhihong wrote:
>
>
> > -Original Message-
> > From: Yuanhan Liu [mailto:yuanhan.liu at linux.intel.com]
> > Sent: Monday, October 10, 2016 11:59 AM
> > To: Michael S. Tsirkin
> > Cc: Maxime Coquelin ; Stephen Hemminger
> > ; dev at dpdk.org
On Mon, Oct 10, 2016 at 12:22:09PM +0800, Yuanhan Liu wrote:
> On Mon, Oct 10, 2016 at 07:17:06AM +0300, Michael S. Tsirkin wrote:
> > On Mon, Oct 10, 2016 at 12:05:31PM +0800, Yuanhan Liu wrote:
> > > On Fri, Sep 30, 2016 at 10:16:43PM +0300, Michael S. Tsirkin wrote:
> > > > > > And the same is d
On Mon, Oct 10, 2016 at 04:16:19AM +, Wang, Zhihong wrote:
>
>
> > -Original Message-
> > From: Yuanhan Liu [mailto:yuanhan.liu at linux.intel.com]
> > Sent: Monday, October 10, 2016 11:59 AM
> > To: Michael S. Tsirkin
> > Cc: Maxime Coquelin ; Stephen Hemminger
> > ; dev at dpdk.org
On Mon, Oct 10, 2016 at 12:05:31PM +0800, Yuanhan Liu wrote:
> On Fri, Sep 30, 2016 at 10:16:43PM +0300, Michael S. Tsirkin wrote:
> > > > And the same is done is done in DPDK:
> > > >
> > > > static inline int __attribute__((always_inline))
> > > > copy_desc_to_mbuf(struct virtio_net *dev, struct
On Mon, Oct 10, 2016 at 11:37:44AM +0800, Yuanhan Liu wrote:
> On Thu, Sep 29, 2016 at 11:21:48PM +0300, Michael S. Tsirkin wrote:
> > On Thu, Sep 29, 2016 at 10:05:22PM +0200, Maxime Coquelin wrote:
> > >
> > >
> > > On 09/29/2016 07:57 PM, Michael S. Tsirkin wrote:
> > Yes but two points.
> >
> -Original Message-
> From: Yuanhan Liu [mailto:yuanhan.liu at linux.intel.com]
> Sent: Monday, October 10, 2016 11:59 AM
> To: Michael S. Tsirkin
> Cc: Maxime Coquelin ; Stephen Hemminger
> ; dev at dpdk.org; qemu-
> devel at nongnu.org; Wang, Zhihong
> Subject: Re: [Qemu-devel] [PATC
On 09/29/2016 10:21 PM, Michael S. Tsirkin wrote:
> On Thu, Sep 29, 2016 at 10:05:22PM +0200, Maxime Coquelin wrote:
>> >
>> >
>> > On 09/29/2016 07:57 PM, Michael S. Tsirkin wrote:
>>> > > On Thu, Sep 29, 2016 at 05:30:53PM +0200, Maxime Coquelin wrote:
>> > ...
> > >
> > > Before enab
On Fri, Sep 30, 2016 at 02:05:10PM +0200, Maxime Coquelin wrote:
>
>
> On 09/29/2016 11:23 PM, Maxime Coquelin wrote:
> >
> >
> > On 09/29/2016 10:21 PM, Michael S. Tsirkin wrote:
> > > On Thu, Sep 29, 2016 at 10:05:22PM +0200, Maxime Coquelin wrote:
> > > >
> > > >
> > > > On 09/29/2016 07:5
On 09/29/2016 11:23 PM, Maxime Coquelin wrote:
>
>
> On 09/29/2016 10:21 PM, Michael S. Tsirkin wrote:
>> On Thu, Sep 29, 2016 at 10:05:22PM +0200, Maxime Coquelin wrote:
>>>
>>>
>>> On 09/29/2016 07:57 PM, Michael S. Tsirkin wrote:
On Thu, Sep 29, 2016 at 05:30:53PM +0200, Maxime Coquelin w
On 09/29/2016 10:21 PM, Michael S. Tsirkin wrote:
> On Thu, Sep 29, 2016 at 10:05:22PM +0200, Maxime Coquelin wrote:
>>
>>
>> On 09/29/2016 07:57 PM, Michael S. Tsirkin wrote:
>>> On Thu, Sep 29, 2016 at 05:30:53PM +0200, Maxime Coquelin wrote:
>> ...
Before enabling anything by default
On Thu, Sep 29, 2016 at 10:05:22PM +0200, Maxime Coquelin wrote:
>
>
> On 09/29/2016 07:57 PM, Michael S. Tsirkin wrote:
> > On Thu, Sep 29, 2016 at 05:30:53PM +0200, Maxime Coquelin wrote:
> ...
> > >
> > > Before enabling anything by default, we should first optimize the 1 slot
> > > case. Ind
On 09/29/2016 07:57 PM, Michael S. Tsirkin wrote:
> On Thu, Sep 29, 2016 at 05:30:53PM +0200, Maxime Coquelin wrote:
...
>>
>> Before enabling anything by default, we should first optimize the 1 slot
>> case. Indeed, micro-benchmark using testpmd in txonly[0] shows ~17%
>> perf regression for 64
On Thu, Sep 29, 2016 at 05:30:53PM +0200, Maxime Coquelin wrote:
>
>
> On 09/28/2016 04:28 AM, Yuanhan Liu wrote:
> > On Tue, Sep 27, 2016 at 10:56:40PM +0300, Michael S. Tsirkin wrote:
> > > On Tue, Sep 27, 2016 at 11:11:58AM +0800, Yuanhan Liu wrote:
> > > > On Mon, Sep 26, 2016 at 10:24:55PM +
On 09/28/2016 04:28 AM, Yuanhan Liu wrote:
> On Tue, Sep 27, 2016 at 10:56:40PM +0300, Michael S. Tsirkin wrote:
>> On Tue, Sep 27, 2016 at 11:11:58AM +0800, Yuanhan Liu wrote:
>>> On Mon, Sep 26, 2016 at 10:24:55PM +0300, Michael S. Tsirkin wrote:
On Mon, Sep 26, 2016 at 11:01:58AM -0700, S
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