[Xen-users] Maximun number of NICs in PV?

["Pablo E. Bullian" <pbullian@xxxxxxxxxxxx>]

Hi all, I'm looking for information regarding the maximum number of network interfaces that a PV can have.

I need to create a PV (VyOS - it's a debian), with more than 15 NICs, but when I try to add more, I get:

[ÂÂÂ 0.209088] xen_netfront: can't alloc rx grant refs
[ÂÂÂ 0.209268] vif vif-15: 12 creating netdev
[ÂÂÂ 0.212789] vif vif-15: failed to write error node for device/vif/15 (12 creating netdev)
[ÂÂÂ 0.214610] vif vif-15: 12 xenbus_dev_probe on device/vif/15
[ÂÂÂ 0.215347] vif vif-15: failed to write error node for device/vif/15 (12 xenbus_dev_probe on device/vif/15)



The machine boots with only 15 NICs. Is there a way to change that?

if I try to do the same, with the same VM on a older Xen I get more NICs (older: release : 2.6.18-194.3.1.el5xen)

Extra info:

releaseÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : 3.10.68-11.el6.centos.alt.x86_64
versionÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : #1 SMP Fri Feb 6 10:40:16 CST 2015
machineÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : x86_64
nr_cpusÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : 24
max_cpu_idÂÂÂÂÂÂÂÂÂÂÂÂ : 23
nr_nodesÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : 2
cores_per_socketÂÂÂÂÂÂ : 6
threads_per_coreÂÂÂÂÂÂ : 2
cpu_mhzÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : 2600
hw_capsÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : bfebfbff:2c100800:00000000:00007f00:77bee3ff:00000000:00000001:00000281
virt_capsÂÂÂÂÂÂÂÂÂÂÂÂÂ : hvm hvm_directio
total_memoryÂÂÂÂÂÂÂÂÂÂ : 65509
free_memoryÂÂÂÂÂÂÂÂÂÂÂ : 62616
sharing_freed_memoryÂÂ : 0
sharing_used_memoryÂÂÂ : 0
outstanding_claimsÂÂÂÂ : 0
free_cpusÂÂÂÂÂÂÂÂÂÂÂÂÂ : 0
xen_majorÂÂÂÂÂÂÂÂÂÂÂÂÂ : 4
xen_minorÂÂÂÂÂÂÂÂÂÂÂÂÂ : 4
xen_extraÂÂÂÂÂÂÂÂÂÂÂÂÂ : .2-2.el6
xen_versionÂÂÂÂÂÂÂÂÂÂÂ : 4.4.2-2.el6
xen_capsÂÂÂÂÂÂÂÂÂÂÂÂÂÂ : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
xen_schedulerÂÂÂÂÂÂÂÂÂ : credit
xen_pagesizeÂÂÂÂÂÂÂÂÂÂ : 4096
platform_paramsÂÂÂÂÂÂÂ : virt_start=0xffff800000000000
xen_changesetÂÂÂÂÂÂÂÂÂ : Thu Apr 23 15:06:13 2015 +0100 git:82363f6-dirty
xen_commandlineÂÂÂÂÂÂÂ : dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all dom0_max_vcpus=4 dom0_vcpus_pin
cc_compilerÂÂÂÂÂÂÂÂÂÂÂ : gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-11)
cc_compile_byÂÂÂÂÂÂÂÂÂ : mockbuild
cc_compile_domainÂÂÂÂÂ : centos.org
cc_compile_dateÂÂÂÂÂÂÂ : Wed May 13 12:28:01 UTC 2015
xend_config_formatÂÂÂÂ : 4


thanks!,

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