Re: 8 nic limit
On 2011-09-03 13:54, Richard Weinberger wrote: Hi! qemu-kvm seems to support only 8 network interfaces. I found this posting from 2009: http://www.mail-archive.com/kvm@vger.kernel.org/msg10104.html Why is MAX_NICS still only 8? Please raise this limit in future releases. I have some use cases where much more than 8 nics are needed. (Lot's of VLANs...) If you avoid the legacy -net and create networks via -device nic and -netdev, you won't face this limit. Jan signature.asc Description: OpenPGP digital signature
8 nic limit
Hi! qemu-kvm seems to support only 8 network interfaces. I found this posting from 2009: http://www.mail-archive.com/kvm@vger.kernel.org/msg10104.html Why is MAX_NICS still only 8? Please raise this limit in future releases. I have some use cases where much more than 8 nics are needed. (Lot's of VLANs...) Thanks, //richard P.s: Please CC me. -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: 8 NIC limit - patch - places limit at 32
It's 8 otherwise- and after the patch is applied, it still only goes to 28 for some reason. 28's acceptable for my needs, so I'll step aside from here leave it to the experts. As for the new -device method, that's all fine good but AFAIK it's not implemented on my platform, so this was the answer. On Wed, 06 Oct 2010 07:54 -0500, Anthony Liguori anth...@codemonkey.ws wrote: On 10/06/2010 12:46 AM, linux_...@proinbox.com wrote: Attached is a patch that allows qemu to have up to 32 NICs, without using the qdev -device method. I'd rather there be no fixed limit and we validate that when add fails because there isn't a TCP slot available, we do the right thing. BTW, using -device, it should be possible to add a very high number of nics because you can specify the PCI address including a function. If this doesn't Just Work today, we should make it work. Regards, Anthony Liguori -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: 8 NIC limit - patch - places limit at 32
* Anthony Liguori (anth...@codemonkey.ws) wrote:
BTW, using -device, it should be possible to add a very high number of
nics because you can specify the PCI address including a function. If
this doesn't Just Work today, we should make it work.
Should work...test...mostly[1], but I don't actually know of any tools that
make use of it.
thanks,
-chris
[1] 40 worked, 48 caused guest kernel stack corruption, didn't dig in to
see why yet.
Here's my simple wrapper to build up the command line:
QEMU=/home/chrisw/git/kvm/qemu-kvm/x86_64-softmmu/qemu-system-x86_64
BIOS=/home/chrisw/git/kvm/qemu-kvm/pc-bios
DISK=/home/chrisw/disk-snap1.img
SCRIPT=/home/chrisw/git/kvm/qemu-kvm/kvm/scripts/qemu-ifup
unset NETARGS
i=0
dev=4
func=0
max_dev=40
while [ $i -lt $max_dev ]
do
unset MULTIFUNC
if [ $(($i + 1)) -lt $max_dev -a $func -eq 0 ]; then
MULTIFUNC=,multifunction=on
fi
NETARGS=${NETARGS} -netdev type=tap,id=netdev$i,script=$SCRIPT -device
virtio-net-pci,mac=52:54:00:12:34:$(printf %.2x\n
$i),netdev=netdev$i,bus=pci.0,addr=$dev.$func$MULTIFUNC
i=$(($i+1))
func=$(($func+1))
if [ $func -eq 8 ]; then
func=0
dev=$(($dev+1))
fi
done
$QEMU -L $BIOS -m 1024 -drive file=$DISK,if=virtio,boot=on $NETARGS -vnc :0
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8 NIC limit
Hello list: I'm working on a project that calls for the creation of a firewall in KVM. While adding a 20-interface trunk of virtio adapters to bring in a dual 10GB bond, I've discovered an 8 NIC limit in QEMU. I found the following thread in the list archives detailing a similar problem: http://kerneltrap.org/mailarchive/linux-kvm/2009/1/29/4848304 It includes a patch for the file qemu/net.h to allow 24 NICs: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm;qemu-kvm/+bug/595873/+attachment/1429544/+files/max_nics.patch In my case I want to attach 29, and have simply changed line 8 to 30 from 24. This will be the first patch I've ever had to do, and so far my internet search yields results that don't seem to apply. Would someone like to recommend a pertinent tutorial? Many thanks -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: 8 NIC limit
On Tue, Oct 5, 2010 at 7:48 AM, linux_...@proinbox.com wrote: Hello list: I'm working on a project that calls for the creation of a firewall in KVM. While adding a 20-interface trunk of virtio adapters to bring in a dual 10GB bond, I've discovered an 8 NIC limit in QEMU. I found the following thread in the list archives detailing a similar problem: http://kerneltrap.org/mailarchive/linux-kvm/2009/1/29/4848304 It includes a patch for the file qemu/net.h to allow 24 NICs: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm;qemu-kvm/+bug/595873/+attachment/1429544/+files/max_nics.patch In my case I want to attach 29, and have simply changed line 8 to 30 from 24. This will be the first patch I've ever had to do, and so far my internet search yields results that don't seem to apply. Would someone like to recommend a pertinent tutorial? Hi there, I commented on the original bug in Launchpad. We're willing and able to carry the patch against qemu-kvm in Ubuntu, I just asked that the reporter at least submit the patch upstream for discussion. I don't see where that has happened yet. It's a trivial patch to submit. Please note in that bug a pointer to the mailing list thread, if you start one. To your specific question, different communities have different requirements on patch submission, so you do need to consult each community. A good place to start might be the Documentation/SubmittingPatches how-to in the kernel tree: * http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob_plain;f=Documentation/SubmittingPatches;hb=HEAD In this case, I think you're going to want to send your patch to the qemu-devel (on CC) mailing list (perhaps in addition to sending it here, to the kvm list). :-Dustin -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: 8 NIC limit
linux_...@proinbox.com writes: Hello list: I'm working on a project that calls for the creation of a firewall in KVM. While adding a 20-interface trunk of virtio adapters to bring in a dual 10GB bond, I've discovered an 8 NIC limit in QEMU. Have you tried creating NICs with -device? The limit shouldn't apply there. -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Fwd: Re: 8 NIC limit
Forgot to cc list, forwarding. In this case, I think you're going to want to send your patch to the qemu-devel (on CC) mailing list (perhaps in addition to sending it here, to the kvm list). Will do, thanks for the pointer. Before I do so, I'd like to bring up one thing that comes to mind. I don't know how to make the determination, but it makes sense to me for the limit defined here to be indicitive of an actual limitation, rather than what seems an arbitrary best-guess as to the most someone might need. If the change ends up being permanent, then I would hope it would be a large enough value to provide a degree of extensibility and prevent the necessity of bumping it up again later when someone else comes along with even greater bandwidth requirements. Perhaps someone could provide some guidance as to a sane, higher number, as opposed to an arbitrary '65000' which would surely prevent this from happening again (knock on wood). For the time being I still have to find something to help learn how to implement the change locally. I rarely have to compile let alone deal with patches, so to me at least this is a considerable obstacle. -Thanks On Tue, 05 Oct 2010 08:24 -0700, Dustin Kirkland kirkl...@canonical.com wrote: On Tue, Oct 5, 2010 at 7:48 AM, linux_...@proinbox.com wrote: Hello list: I'm working on a project that calls for the creation of a firewall in KVM. While adding a 20-interface trunk of virtio adapters to bring in a dual 10GB bond, I've discovered an 8 NIC limit in QEMU. I found the following thread in the list archives detailing a similar problem: http://kerneltrap.org/mailarchive/linux-kvm/2009/1/29/4848304 It includes a patch for the file qemu/net.h to allow 24 NICs: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm;qemu-kvm/+bug/595873/+attachment/1429544/+files/max_nics.patch In my case I want to attach 29, and have simply changed line 8 to 30 from 24. This will be the first patch I've ever had to do, and so far my internet search yields results that don't seem to apply. Would someone like to recommend a pertinent tutorial? Hi there, I commented on the original bug in Launchpad. We're willing and able to carry the patch against qemu-kvm in Ubuntu, I just asked that the reporter at least submit the patch upstream for discussion. I don't see where that has happened yet. It's a trivial patch to submit. Please note in that bug a pointer to the mailing list thread, if you start one. To your specific question, different communities have different requirements on patch submission, so you do need to consult each community. A good place to start might be the Documentation/SubmittingPatches how-to in the kernel tree: * http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob_plain;f=Documentation/SubmittingPatches;hb=HEAD In this case, I think you're going to want to send your patch to the qemu-devel (on CC) mailing list (perhaps in addition to sending it here, to the kvm list). :-Dustin -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: 8 NIC limit
Have you tried creating NICs with -device? I'm not sure what that is, will look into it, thanks. I'm using ProxmoxVE, and currently add them via a web interface. Someone happens to host a screenshot of that part here: http://c-nergy.be/blog/wp-content/uploads/Proxmox_Net2.png On Tue, 05 Oct 2010 17:57 +0200, Markus Armbruster arm...@redhat.com wrote: linux_...@proinbox.com writes: Hello list: I'm working on a project that calls for the creation of a firewall in KVM. While adding a 20-interface trunk of virtio adapters to bring in a dual 10GB bond, I've discovered an 8 NIC limit in QEMU. Have you tried creating NICs with -device? The limit shouldn't apply there. -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: 8 NIC limit
On 10/5/2010 9:48 AM, linux_...@proinbox.com wrote: Hello list: I'm working on a project that calls for the creation of a firewall in KVM. While adding a 20-interface trunk of virtio adapters to bring in a dual 10GB bond, I've discovered an 8 NIC limit in QEMU. I found the following thread in the list archives detailing a similar problem: http://kerneltrap.org/mailarchive/linux-kvm/2009/1/29/4848304 It includes a patch for the file qemu/net.h to allow 24 NICs: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm;qemu-kvm/+bug/595873/+attachment/1429544/+files/max_nics.patch In my case I want to attach 29, and have simply changed line 8 to 30 from 24. I'd guess you'll bump into a pci device number limit (I believe it is 32 at the moment). This will be the first patch I've ever had to do, and so far my internet search yields results that don't seem to apply. Would someone like to recommend a pertinent tutorial? Many thanks -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: 8 NIC limit
* linux_...@proinbox.com (linux_...@proinbox.com) wrote: I don't know how to make the determination, but it makes sense to me for the limit defined here to be indicitive of an actual limitation, rather than what seems an arbitrary best-guess as to the most someone might need. The actual limitation is that we have only a single PCI bus. The network devices are single function devices. While there are 32 slots on the PCI bus, a few are already taken (typically the first 3, leaving 29 free slots). But, as Markus mentioned, this limitation is only for legacy command line option. The modern qdev way[1] should not hit this same limitation. thanks, -chris [1] http://www.linux-kvm.org/page/Qdev_status -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: 8 NIC limit - patch - places limit at 32
Attached is a patch that allows qemu to have up to 32 NICs, without using the qdev -device method. max_nics.patch Description: Binary data
