[dpdk-stable] vhost: many vhost user ports (backporting to v16.11)

[Wojciechowicz, RobertX]

Hi,

> > It is also worth pointing out that OVS 2.7 will use 16.11
>
> One question though: will they use v16.11.1 or something like that?

@Mark do you know what exactly version OVS is going to use?

Br,
Robert

> -----Original Message-----
> From: Yuanhan Liu [mailto:yuanhan.liu at linux.intel.com]
> Sent: Tuesday, February 14, 2017 3:42 AM
> To: Wojciechowicz, RobertX <robertx.wojciechowicz at intel.com>
> Cc: stable at dpdk.org; Mcnamara, John <john.mcnamara at intel.com>; Gray,
> Mark D <mark.d.gray at intel.com>; Devlin, Michelle
> <michelle.devlin at intel.com>; Weglicki, MichalX
> <michalx.weglicki at intel.com>; Thomas Monjalon
> <thomas.monjalon at 6wind.com>
> Subject: Re: [dpdk-stable] vhost: many vhost user ports (backporting to
> v16.11)
> 
> On Thu, Feb 09, 2017 at 07:56:29AM -0500, Robert Wojciechowicz wrote:
> > Hi,
> >
> > in DPDK v17.02-rc2 there is available following patch:
> >
> > commit: 59317cef249c0b23098543df527b3e360ce9764f
> >
> > """
> > vhost: allow many vhost-user ports
> > Currently select() is used to monitor file descriptors for vhostuser
> > ports. This limits the number of ports possible to create since the
> > fd number is used as index in the fd_set and we have seen fds > 1023.
> > This patch changes select() to poll(). This way we can keep an
> > packed (pollfd) array for the fds, e.g. as many fds as the size of
> > the array.
> > Also see:
> > http://dpdk.org/ml/archives/dev/2016-April/037024.html
> > Reported-by: Patrik Andersson <patrik.r.andersson at ericsson.com>
> > Signed-off-by: Jan Wickbom <jan.wickbom at ericsson.com>
> > Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
> > """
> >
> > I tested this feature with OVS and DPDK v17.02-rc2.
> > I applied also this patch to DPDK v16.11 without any issues
> > and performed the same tests as for v17.02-rc2.
> > It solves the problem with connecting many VMs to one vSwitch
> > instance (in my tests 70 VMs) with vhost user ports.
> >
> > Is it possible to backport this feature to DPDK v16.11?
> 
> As a vhost maintainer, I think this patch could be backported to v16.11:
> it resolves an issue you met.
> 
> Just let me know if anyone has objections.
> 
> > It is also worth pointing out that OVS 2.7 will use 16.11
> 
> One question though: will they use v16.11.1 or something like that?
> 
> 	--yliu
> 
> > which means we will have this bug for the next 6 months at least
> > unless we can backport.
> >
> > What's your opinion?
> >
> > Br,
> > Robert