Hello all, Does anybody know something about the restriction of 3 network interfaces in domU that was discussed here: http://lists.xensource.com/archives/html/xen-users/2006-05/msg00024.html http://lists.xensource.com/archives/html/xen-users/2006-08/msg00968.html Please tell, is the problem solved? Thank you! -- WBR, i.m.chubin _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Petersson, Mats
2007-Mar-27 12:24 UTC
RE: [Xen-users] Maximum number of interfaces in DomU
> -----Original Message----- > From: xen-users-bounces@lists.xensource.com > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of > Igor Chubin > Sent: 27 March 2007 13:13 > To: xen-users@lists.xensource.com > Subject: [Xen-users] Maximum number of interfaces in DomU > > > Hello all, > > > Does anybody know something about > the restriction of 3 network interfaces > in domU that was discussed here: > > http://lists.xensource.com/archives/html/xen-users/2006-05/msg > 00024.html > http://lists.xensource.com/archives/html/xen-users/2006-08/msg > 00968.html > > > Please tell, is the problem solved?No, and there is no plan to "solve" this "problem". -- Mats> > Thank you! > > -- > WBR, i.m.chubin > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users > > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Di, Mär 27, 2007 at 02:24:20 +0200, Petersson, Mats wrote: ...> > Does anybody know something about > > the restriction of 3 network interfaces > > in domU that was discussed here: > > > > http://lists.xensource.com/archives/html/xen-users/2006-05/msg > > 00024.html > > http://lists.xensource.com/archives/html/xen-users/2006-08/msg > > 00968.html > > > > > > Please tell, is the problem solved? > > No, and there is no plan to "solve" this "problem".Quotes around the words solve and problem mean that this is not a problem at all? -- WBR, i.m.chubin _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Petersson, Mats
2007-Mar-27 12:48 UTC
RE: [Xen-users] Maximum number of interfaces in DomU
> -----Original Message----- > From: Igor Chubin [mailto:igor@chub.in] > Sent: 27 March 2007 13:31 > To: Petersson, Mats > Cc: Igor Chubin; xen-users@lists.xensource.com > Subject: Re: [Xen-users] Maximum number of interfaces in DomU > > On Di, Mär 27, 2007 at 02:24:20 +0200, Petersson, Mats wrote: > > ... > > > Does anybody know something about > > > the restriction of 3 network interfaces > > > in domU that was discussed here: > > > > > > http://lists.xensource.com/archives/html/xen-users/2006-05/msg > > > 00024.html > > > http://lists.xensource.com/archives/html/xen-users/2006-08/msg > > > 00968.html > > > > > > > > > Please tell, is the problem solved? > > > > No, and there is no plan to "solve" this "problem". > > > Quotes around the words solve and problem > mean that this is not a problem at all?Well, that obviously depends on how you look at it. It is of course considered a problem by some people. But it''s not considered a problem by the Xen developers community, I think, because no one has so far come up with a good argument why you actually need a GUEST to have more than three virtual interfaces. It''s not limiting the bandwidth (which three physical connectors could perhaps do), because the speed of each interface is limited only by CPU and memory access speed in the guest and Dom0. It is of course limiting the number of different sources that guest can get data from with only the interface as a the distinguishing factor. Can you explain what the setup is where you need this, and why you need more than three virtual devices? It may help forward the argument for a fix, but there may also be others who have the solved the same sort of problem within the community here, without using more than three interfaces. [Just to note: The reason it''s limited to 3 interfaces is simply that''s how many fit into one 4KB memory section, which makes it easy to manage in the code. Adding more interfaces would be possible, but it would complicate matters by some amount, as the interface between Dom0 and DomU is based on physical memory pages, and sending a list of those will make not only break backwards compatibility, but also complicate the common case of using (up to) three interfaces]. Finally, I''m indeed a Xen developer, but I''ve got very little to do with virtual network interfaces, so I may not have grasped the whole reasoning why this limit is and if/how difficult it is to change, nor any other complications or other issues involved. I also have not been involved in the decision to "not solve this problem". But I believe that if this was actually a REAL PROBLEM to a lot of people, then it would have been solved a long time ago. It may be a case of "yes, it''s possible to solve, but not enough people are asking for it", or it may simply be that it''s "not a real problem". -- Mats> > -- > WBR, i.m.chubin > > > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Steve Brueckner
2007-Mar-27 15:09 UTC
RE: [Xen-users] Maximum number of interfaces in DomU
>>>> Does anybody know something about the restriction of 3 network >>>> interfaces in domU that was discussed here: >>>> >>>> http://lists.xensource.com/archives/html/xen-users/2006-05/msg >>>> 00024.html >>>> http://lists.xensource.com/archives/html/xen-users/2006-08/msg >>>> 00968.html >>>> >>>> Please tell, is the problem solved? >>> >>> No, and there is no plan to "solve" this "problem". >> >> Quotes around the words solve and problem mean that this is not a >> problem at all? > > Can you explain what the setup is where you need this, and why you > need more than three virtual devices? It may help forward the > argument for a fix, but there may also be others who have the solved > the same sort of problem within the community here, without using > more than three interfaces. >I''ve been eager for this "issue" to be "addressed" (quotation marks are used in good fun) for quite a while. I need a domU that acts as a router between multiple internal domUs (via vifs) and multiple external LANs (via peths). I''ve seen this question pop up on the mailing list every 4 months or so, and I always hope to see a new answer! Steve Brueckner, ATC-NY _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On 3/27/07, Steve Brueckner <steve@atc-nycorp.com> wrote:> I''ve been eager for this "issue" to be "addressed" (quotation marks > are used in good fun) for quite a while. I need a domU that acts as > a router between multiple internal domUs (via vifs) and multiple > external LANs (via peths). I''ve seen this question pop up on the > mailing list every 4 months or so, and I always hope to see a > new answer!Most physical routers on the planet are just fine with three nic''s or less. What is the specific application? Is it too complex to place "dummy" vif''s between 2+ router domu''s and implement the network logic with ipforwarding and iptables? jerry -- "Oh joy! Rapture! I''ve got a brain" -Scarecrow _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Jerry Amundson wrote:> On 3/27/07, Steve Brueckner <steve@atc-nycorp.com> wrote: >> I''ve been eager for this "issue" to be "addressed" (quotation marks >> are used in good fun) for quite a while. I need a domU that acts as >> a router between multiple internal domUs (via vifs) and multiple >> external LANs (via peths). I''ve seen this question pop up on the >> mailing list every 4 months or so, and I always hope to see a >> new answer! > > Most physical routers on the planet are just fine with three nic''s or > less. What is the specific application? > Is it too complex to place "dummy" vif''s between 2+ router domu''s and > implement the network logic with ipforwarding and iptables?You can use vlans to get more interface. DomU ---/\--- eth0.10\ /vif0.10 | eth0.20 ---- vif0.20 > vif vlans are plugged into the bridge eth0.30/ \vif0.30 | Greetings, -timo -- Timo Benk - Jabber ID: fry@downtempo.de - ICQ ID: #414944731 PGP Public Key: http://www.m28s01.vlinux.de/timo_benk_gpg_key.asc _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Martti Kuparinen
2007-May-11 07:04 UTC
Re: [Xen-users] Maximum number of interfaces in DomU
Igor Chubin wrote:> Does anybody know something about > the restriction of 3 network interfaces > in domU that was discussed here:I have 7 interfaces in NetBSD domU (having 8 will crash the domU so 7 is the max number of interfaces right now for me on this host). This is my domU --------------- n104# ifconfig -l lo0 xennet0 xennet1 xennet2 xennet3 xennet4 xennet5 xennet6 n104# dmesg NetBSD 4.0_BETA2 (XEN3_DOMU) #129: Wed May 9 06:18:44 EEST 2007 root@xxx.com:/autobuild/netbsd-4.x/obj/i386/sys/arch/i386/compile/XEN3_DOMU total memory = 512 MB avail memory = 498 MB mainbus0 (root) hypervisor0 at mainbus0 vcpu0 at hypervisor0: (uniprocessor) vcpu0: Intel Pentium Pro, II or III (686-class), 2133.41 MHz, id 0x6f7 vcpu0: features bfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR> vcpu0: features bfebfbff<PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX> vcpu0: features bfebfbff<FXSR,SSE,SSE2,SS,HTT,TM,SBF> debug virtual interrupt using event channel 3 xenbus0 at hypervisor0: Xen Virtual Bus Interface This is my dom0 --------------- ROOT xen3:~> xm list Name ID Mem VCPUs State Time(s) Domain-0 0 256 1 r----- 791.1 NetBSD 13 509 1 -b---- 1.0 ROOT xen3:~> uname -srm NetBSD 4.0_BETA2 i386 ROOT xen3:~> pkg_info | grep xen xentools30-3.0.4 Userland Tools for Xen xenkernel30-3.0.4 Xen3 Kernel _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users