Disabling mergeable rx buffers for the guest

Disabling mergeable rx buffers for the guest

[Naor Shlomo]

Hi,

I am trying to disable the mergeable rx buffers for a Linux guest but I am currently unable to do so.

I tried looking in the code of libvirt in order to find the "-global virtio-net-pci.mrg_rxbuf=off" but the only globals configured are:
PIIX4_PM.disable_s*, isa-fdc.drive, isa-fdc.bootindex, ram_size and vram_size

Is there a way to configure the XML configuration for the domain and disable the mergeable buffers? 
If not, is there a way to somehow do it from the guest? (I don't want to mess with the host)

Thanks,
Naor

Re: Disabling mergeable rx buffers for the guest

[Paolo Bonzini]

Il 16/07/2013 07:09, Naor Shlomo ha scritto:
> Hi,
> 
> I am trying to disable the mergeable rx buffers for a Linux guest but I am currently unable to do so.
> 
> I tried looking in the code of libvirt in order to find the "-global virtio-net-pci.mrg_rxbuf=off" but the only globals configured are:
> PIIX4_PM.disable_s*, isa-fdc.drive, isa-fdc.bootindex, ram_size and vram_size
> 
> Is there a way to configure the XML configuration for the domain and disable the mergeable buffers? 
> If not, is there a way to somehow do it from the guest? (I don't want to mess with the host)

You can use something like this:

  <qemu:commandline>
    <qemu:arg value='-global'/>
    <qemu:env name='mrg_rxbuf' value='off'/>
  </qemu:commandline>

Paolo

RE: Disabling mergeable rx buffers for the guest

[Naor Shlomo]

Hi Paolo and thanks for your quick reply,

I tried editing (virsh edit) the domain's XML and put the XML excerpt you gave me everywhere but with no success.
The moment I exit the edit mode the text was gone (I guess it didn't pass some sort of sanity and that's why it was automatically erased).

What am I doing wrong?

Naor

-----Original Message-----
From: Paolo Bonzini [mailto:paolo.bonzini@gmail.com] On Behalf Of Paolo Bonzini
Sent: Tuesday, July 16, 2013 9:12 AM
To: Naor Shlomo
Cc: kvm@vger.kernel.org
Subject: Re: Disabling mergeable rx buffers for the guest

Il 16/07/2013 07:09, Naor Shlomo ha scritto:
> Hi,
> 
> I am trying to disable the mergeable rx buffers for a Linux guest but I am currently unable to do so.
> 
> I tried looking in the code of libvirt in order to find the "-global virtio-net-pci.mrg_rxbuf=off" but the only globals configured are:
> PIIX4_PM.disable_s*, isa-fdc.drive, isa-fdc.bootindex, ram_size and vram_size
> 
> Is there a way to configure the XML configuration for the domain and disable the mergeable buffers? 
> If not, is there a way to somehow do it from the guest? (I don't want to mess with the host)

You can use something like this:

  <qemu:commandline>
    <qemu:arg value='-global'/>
    <qemu:env name='mrg_rxbuf' value='off'/>
  </qemu:commandline>

Paolo

Re: Disabling mergeable rx buffers for the guest

[Paolo Bonzini]

Il 16/07/2013 08:40, Naor Shlomo ha scritto:
> Hi Paolo and thanks for your quick reply,
> 
> I tried editing (virsh edit) the domain's XML and put the XML excerpt you gave me everywhere but with no success.
> The moment I exit the edit mode the text was gone (I guess it didn't pass some sort of sanity and that's why it was automatically erased).
> 
> What am I doing wrong?

My fault.  You need to change the <domain> opening tag to

<domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>

See http://libvirt.org/drvqemu.html#qemucommand for the docs.

Paolo

RE: Disabling mergeable rx buffers for the guest

[Naor Shlomo]

Thanks again Paolo,

I used your string and read the documents in the site you referred me to but could not understand why doesn't it accept the xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0' string.

I tried it on the following version:
Compiled against library: libvir 0.9.8
Using library: libvir 0.9.8
Using API: QEMU 0.9.8
Running hypervisor: QEMU 1.0.0

So according to the site it should be supported.

Any idea what am I missing now?

Naor

-----Original Message-----
From: Paolo Bonzini [mailto:pbonzini@redhat.com] 
Sent: Tuesday, July 16, 2013 9:42 AM
To: Naor Shlomo
Cc: kvm@vger.kernel.org
Subject: Re: Disabling mergeable rx buffers for the guest

Il 16/07/2013 08:40, Naor Shlomo ha scritto:
> Hi Paolo and thanks for your quick reply,
> 
> I tried editing (virsh edit) the domain's XML and put the XML excerpt you gave me everywhere but with no success.
> The moment I exit the edit mode the text was gone (I guess it didn't pass some sort of sanity and that's why it was automatically erased).
> 
> What am I doing wrong?

My fault.  You need to change the <domain> opening tag to

<domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>

See http://libvirt.org/drvqemu.html#qemucommand for the docs.

Paolo

Re: Disabling mergeable rx buffers for the guest

[Paolo Bonzini]

Il 16/07/2013 10:06, Naor Shlomo ha scritto:
> Thanks again Paolo,
> 
> I used your string and read the documents in the site you referred me to but could not understand why doesn't it accept the xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0' string.
> 
> I tried it on the following version:
> Compiled against library: libvir 0.9.8
> Using library: libvir 0.9.8
> Using API: QEMU 0.9.8
> Running hypervisor: QEMU 1.0.0
> 
> So according to the site it should be supported.
> 
> Any idea what am I missing now?

Not sure.  Can you post here the full XML, and the one you're trying to use?

Paolo

> Naor
> 
> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@redhat.com] 
> Sent: Tuesday, July 16, 2013 9:42 AM
> To: Naor Shlomo
> Cc: kvm@vger.kernel.org
> Subject: Re: Disabling mergeable rx buffers for the guest
> 
> Il 16/07/2013 08:40, Naor Shlomo ha scritto:
>> Hi Paolo and thanks for your quick reply,
>>
>> I tried editing (virsh edit) the domain's XML and put the XML excerpt you gave me everywhere but with no success.
>> The moment I exit the edit mode the text was gone (I guess it didn't pass some sort of sanity and that's why it was automatically erased).
>>
>> What am I doing wrong?
> 
> My fault.  You need to change the <domain> opening tag to
> 
> <domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
> 
> See http://libvirt.org/drvqemu.html#qemucommand for the docs.
> 
> Paolo
> 

RE: Disabling mergeable rx buffers for the guest

[Naor Shlomo]

Hi Paolo,

For some unknown reason it suddenly started to accept the changes to the XML and the strings you gave me are now in place.
Upon machine start I now receive the following error messages:

virsh # start NaorDev
error: Failed to start domain NaorDev
error: internal error Process exited while reading console log output: kvm: -global: requires an argument"

Here's the XML:

<domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
  <name>NaorDev</name>
  <uuid>60b5a0ab-8932-47c1-8674-760c7e1f4743</uuid>
  <memory>2118656</memory>
  <currentMemory>2118656</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc-1.0'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' cache='writeback'/>
      <source file='/var/lib/libvirt/images/NaorDev.img'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/var/lib/libvirt/images/NaorAddonHdd.qcow'/>
      <target dev='vdb' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </disk>
    <controller type='ide' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:c6:b7:a3'/>
      <source bridge='mngmnt'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <interface type='bridge'>
      <mac address='52:54:00:9e:44:90'/>
      <source bridge='client'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </interface>
    <interface type='bridge'>
      <mac address='52:54:00:e7:f9:bf'/>
      <source bridge='server'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </memballoon>
  </devices>
  <qemu:commandline>
    <qemu:arg value='-global'/>
    <qemu:env name='mrg_rxbuf' value='off'/>
  </qemu:commandline>
</domain>

Naor

-----Original Message-----
From: Paolo Bonzini [mailto:pbonzini@redhat.com] 
Sent: Tuesday, July 16, 2013 12:36 PM
To: Naor Shlomo
Cc: kvm@vger.kernel.org
Subject: Re: Disabling mergeable rx buffers for the guest

Il 16/07/2013 10:06, Naor Shlomo ha scritto:
> Thanks again Paolo,
> 
> I used your string and read the documents in the site you referred me to but could not understand why doesn't it accept the xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0' string.
> 
> I tried it on the following version:
> Compiled against library: libvir 0.9.8 Using library: libvir 0.9.8 
> Using API: QEMU 0.9.8 Running hypervisor: QEMU 1.0.0
> 
> So according to the site it should be supported.
> 
> Any idea what am I missing now?

Not sure.  Can you post here the full XML, and the one you're trying to use?

Paolo

> Naor
> 
> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
> Sent: Tuesday, July 16, 2013 9:42 AM
> To: Naor Shlomo
> Cc: kvm@vger.kernel.org
> Subject: Re: Disabling mergeable rx buffers for the guest
> 
> Il 16/07/2013 08:40, Naor Shlomo ha scritto:
>> Hi Paolo and thanks for your quick reply,
>>
>> I tried editing (virsh edit) the domain's XML and put the XML excerpt you gave me everywhere but with no success.
>> The moment I exit the edit mode the text was gone (I guess it didn't pass some sort of sanity and that's why it was automatically erased).
>>
>> What am I doing wrong?
> 
> My fault.  You need to change the <domain> opening tag to
> 
> <domain type='qemu' 
> xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
> 
> See http://libvirt.org/drvqemu.html#qemucommand for the docs.
> 
> Paolo
> 

Re: Disabling mergeable rx buffers for the guest

[Paolo Bonzini]

Il 16/07/2013 12:40, Naor Shlomo ha scritto:
> Hi Paolo,
> 
> For some unknown reason it suddenly started to accept the changes to the XML and the strings you gave me are now in place.

Good.

> Upon machine start I now receive the following error messages:
> 
> virsh # start NaorDev
> error: Failed to start domain NaorDev
> error: internal error Process exited while reading console log output: kvm: -global: requires an argument"
> 

That's because I cut-and-pasted without reading:

>   <qemu:commandline>
>     <qemu:arg value='-global'/>
>     <qemu:env name='mrg_rxbuf' value='off'/>
>   </qemu:commandline>

The right one is (or at this point I'd better say "should be"):

   <qemu:commandline>
     <qemu:arg value='-global'/>
     <qemu:arg value='virtio-net-pci.mrg_rxbuf=off'/>
   </qemu:commandline>

Paolo

> </domain>
> 
> Naor
> 
> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@redhat.com] 
> Sent: Tuesday, July 16, 2013 12:36 PM
> To: Naor Shlomo
> Cc: kvm@vger.kernel.org
> Subject: Re: Disabling mergeable rx buffers for the guest
> 
> Il 16/07/2013 10:06, Naor Shlomo ha scritto:
>> Thanks again Paolo,
>>
>> I used your string and read the documents in the site you referred me to but could not understand why doesn't it accept the xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0' string.
>>
>> I tried it on the following version:
>> Compiled against library: libvir 0.9.8 Using library: libvir 0.9.8 
>> Using API: QEMU 0.9.8 Running hypervisor: QEMU 1.0.0
>>
>> So according to the site it should be supported.
>>
>> Any idea what am I missing now?
> 
> Not sure.  Can you post here the full XML, and the one you're trying to use?
> 
> Paolo
> 
>> Naor
>>
>> -----Original Message-----
>> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
>> Sent: Tuesday, July 16, 2013 9:42 AM
>> To: Naor Shlomo
>> Cc: kvm@vger.kernel.org
>> Subject: Re: Disabling mergeable rx buffers for the guest
>>
>> Il 16/07/2013 08:40, Naor Shlomo ha scritto:
>>> Hi Paolo and thanks for your quick reply,
>>>
>>> I tried editing (virsh edit) the domain's XML and put the XML excerpt you gave me everywhere but with no success.
>>> The moment I exit the edit mode the text was gone (I guess it didn't pass some sort of sanity and that's why it was automatically erased).
>>>
>>> What am I doing wrong?
>>
>> My fault.  You need to change the <domain> opening tag to
>>
>> <domain type='qemu' 
>> xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
>>
>> See http://libvirt.org/drvqemu.html#qemucommand for the docs.
>>
>> Paolo
>>
> 

Re: Disabling mergeable rx buffers for the guest

[Daniel P. Berrange]

On Tue, Jul 16, 2013 at 10:40:28AM +0000, Naor Shlomo wrote:
> Hi Paolo,
> 
> For some unknown reason it suddenly started to accept the changes to the XML and the strings you gave me are now in place.
> Upon machine start I now receive the following error messages:
> 
> virsh # start NaorDev
> error: Failed to start domain NaorDev
> error: internal error Process exited while reading console log output: kvm: -global: requires an argument
> 
> Here's the XML:
> 

>   <qemu:commandline>
>     <qemu:arg value='-global'/>
>     <qemu:env name='mrg_rxbuf' value='off'/>
>   </qemu:commandline>

Presumably what you wanted to do was

   <qemu:commandline>
     <qemu:arg value='-global'/>
     <qemu:arg value='mrg_rxbuf=off'/>
   </qemu:commandline>

Rather than setting an environment variable.

Regards,
Daniel
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RE: Disabling mergeable rx buffers for the guest

[Naor Shlomo]

Paolo, 

Sorry for all the trouble.
We got a progress. Your last qemu:commandline really worked and I was able to try and start the machine.
The problem is that I reached up to the tun driver load section and then the machine shut itself down.

The last lines of the console showed the following:

[    1.568226] Fixed MDIO Bus: probed
[    1.568833] tun: Universal TUN/TAP device driver, 1.6
[    1.569108] tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>

And it got me back to the virsh command line.

Here's an output of the log file:

LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-1.0 -no-kvm -m 2069 -smp 1,sockets=1,cores=1,threads=1 -name NaorDev -uuid 60b5a0ab-8932-47c1-8674-760c7e1f4743 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/NaorDev.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -drive file=/var/lib/libvirt/images/NaorDev.img,if=none,id=drive-virtio-disk0,format=raw,cache=writeback -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive file=/var/lib/libvirt/images/NaorAddonHdd.qcow,if=none,id=drive-virtio-disk1,format=qcow2,cache=none -device virtio-blk-pci,bus=pci.0,addr=0x8,drive=drive-virtio-disk1,id=virt
 io-disk1 -netdev tap,fd=18,id=hostnet0,vhost=on,vhostfd=19 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:c6:b7:a3,bus=pci.0,addr=0x3 -netdev tap,fd=20,id=hostnet1,vhost=on,vhostfd=21 -device virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:00:9e:44:90,bus=pci.0,addr=0x4 -netdev tap,fd=22,id=hostnet2,vhost=on,vhostfd=23 -device virtio-net-pci,netdev=hostnet2,id=net2,mac=52:54:00:e7:f9:bf,bus=pci.0,addr=0x7 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc 127.0.0.1:0 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -global virtio-net-pci.mrg_rxbuf=off
Domain id=9 is tainted: custom-argv
char device redirected to /dev/pts/1
2013-07-16 12:48:26.440+0000: shutting down

and here's the output of lsmod:

vhost_net              32360  0 
macvtap                18529  1 vhost_net
macvlan                19003  1 macvtap
ip6table_filter        12816  0 
ip6_tables             27686  1 ip6table_filter
ebtable_nat            12808  0 
ebtables               31024  1 ebtable_nat
ipt_MASQUERADE         12760  3 
iptable_nat            13230  1 
nf_nat                 25646  2 ipt_MASQUERADE,iptable_nat
nf_conntrack_ipv4      14531  4 iptable_nat,nf_nat
nf_defrag_ipv4         12730  1 nf_conntrack_ipv4
xt_state               12579  1 
nf_conntrack           83300  5 ipt_MASQUERADE,iptable_nat,nf_nat,nf_conntrack_ipv4,xt_state
ipt_REJECT             12577  2 
xt_CHECKSUM            12550  1 
iptable_mangle         12735  1 
xt_tcpudp              12604  5 
iptable_filter         12811  1 
ip_tables              27474  3 iptable_nat,iptable_mangle,iptable_filter
x_tables               29892  12 ip6table_filter,ip6_tables,ebtables,ipt_MASQUERADE,iptable_nat,xt_state,ipt_REJECT,xt_CHECKSUM,iptable_mangle,xt_tcpudp,iptable_filter,ip_tables
dm_crypt               23126  0 
coretemp               13642  0 
kvm_intel             137888  0 
kvm                   422160  1 kvm_intel
ext2                   73799  1 
gpio_ich               13384  0 
dm_multipath           23306  0 
scsi_dh                14589  1 dm_multipath
lp                     17800  0 
microcode              23030  0 
parport                46563  1 lp
bridge                 91498  0 
sb_edac                18104  0 
stp                    12977  1 bridge
llc                    14598  2 bridge,stp
joydev                 17694  0 
edac_core              53053  3 sb_edac
shpchp                 37278  0 
lpc_ich                17145  0 
mei                    41410  0 
acpi_power_meter       18124  0 
mac_hid                13254  0 
btrfs                 781017  0 
zlib_deflate           27140  1 btrfs
libcrc32c              12645  1 btrfs
vesafb                 13846  1 
hid_generic            12541  0 
usbhid                 47259  0 
hid                   100815  2 hid_generic,usbhid
ses                    17418  0 
enclosure              15313  1 ses
ghash_clmulni_intel    13221  0 
aesni_intel            51134  0 
cryptd                 20531  2 ghash_clmulni_intel,aesni_intel
aes_x86_64             17256  1 aesni_intel
megaraid_sas           82737  2 
ixgbe                 184924  0 
dca                    15233  1 ixgbe
mdio                   13808  1 ixgbe
tg3                   156594  0 
wmi                    19257  0

I will appreciate it if you tell me what I am missing now.

Thanks,
Naor

-----Original Message-----
From: Paolo Bonzini [mailto:pbonzini@redhat.com] 
Sent: Tuesday, July 16, 2013 1:42 PM
To: Naor Shlomo
Cc: kvm@vger.kernel.org
Subject: Re: Disabling mergeable rx buffers for the guest

Il 16/07/2013 12:40, Naor Shlomo ha scritto:
> Hi Paolo,
> 
> For some unknown reason it suddenly started to accept the changes to the XML and the strings you gave me are now in place.

Good.

> Upon machine start I now receive the following error messages:
> 
> virsh # start NaorDev
> error: Failed to start domain NaorDev
> error: internal error Process exited while reading console log output: kvm: -global: requires an argument"
> 

That's because I cut-and-pasted without reading:

>   <qemu:commandline>
>     <qemu:arg value='-global'/>
>     <qemu:env name='mrg_rxbuf' value='off'/>
>   </qemu:commandline>

The right one is (or at this point I'd better say "should be"):

   <qemu:commandline>
     <qemu:arg value='-global'/>
     <qemu:arg value='virtio-net-pci.mrg_rxbuf=off'/>
   </qemu:commandline>

Paolo

> </domain>
> 
> Naor
> 
> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
> Sent: Tuesday, July 16, 2013 12:36 PM
> To: Naor Shlomo
> Cc: kvm@vger.kernel.org
> Subject: Re: Disabling mergeable rx buffers for the guest
> 
> Il 16/07/2013 10:06, Naor Shlomo ha scritto:
>> Thanks again Paolo,
>>
>> I used your string and read the documents in the site you referred me to but could not understand why doesn't it accept the xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0' string.
>>
>> I tried it on the following version:
>> Compiled against library: libvir 0.9.8 Using library: libvir 0.9.8 
>> Using API: QEMU 0.9.8 Running hypervisor: QEMU 1.0.0
>>
>> So according to the site it should be supported.
>>
>> Any idea what am I missing now?
> 
> Not sure.  Can you post here the full XML, and the one you're trying to use?
> 
> Paolo
> 
>> Naor
>>
>> -----Original Message-----
>> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
>> Sent: Tuesday, July 16, 2013 9:42 AM
>> To: Naor Shlomo
>> Cc: kvm@vger.kernel.org
>> Subject: Re: Disabling mergeable rx buffers for the guest
>>
>> Il 16/07/2013 08:40, Naor Shlomo ha scritto:
>>> Hi Paolo and thanks for your quick reply,
>>>
>>> I tried editing (virsh edit) the domain's XML and put the XML excerpt you gave me everywhere but with no success.
>>> The moment I exit the edit mode the text was gone (I guess it didn't pass some sort of sanity and that's why it was automatically erased).
>>>
>>> What am I doing wrong?
>>
>> My fault.  You need to change the <domain> opening tag to
>>
>> <domain type='qemu' 
>> xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
>>
>> See http://libvirt.org/drvqemu.html#qemucommand for the docs.
>>
>> Paolo
>>
> 

RE: Disabling mergeable rx buffers for the guest

[Naor Shlomo]

Thanks Daniel,

Paolo already got it right, it's:

<qemu:commandline>
  <qemu:arg value='-global'/>
  <qemu:arg value='virtio-net-pci.mrg_rxbuf=off'/>
</qemu:commandline>

-----Original Message-----
From: Daniel P. Berrange [mailto:berrange@redhat.com] 
Sent: Tuesday, July 16, 2013 1:43 PM
To: Naor Shlomo
Cc: Paolo Bonzini; kvm@vger.kernel.org
Subject: Re: Disabling mergeable rx buffers for the guest

On Tue, Jul 16, 2013 at 10:40:28AM +0000, Naor Shlomo wrote:
> Hi Paolo,
> 
> For some unknown reason it suddenly started to accept the changes to the XML and the strings you gave me are now in place.
> Upon machine start I now receive the following error messages:
> 
> virsh # start NaorDev
> error: Failed to start domain NaorDev
> error: internal error Process exited while reading console log output: kvm: -global: requires an argument
> 
> Here's the XML:
> 

>   <qemu:commandline>
>     <qemu:arg value='-global'/>
>     <qemu:env name='mrg_rxbuf' value='off'/>
>   </qemu:commandline>

Presumably what you wanted to do was

   <qemu:commandline>
     <qemu:arg value='-global'/>
     <qemu:arg value='mrg_rxbuf=off'/>
   </qemu:commandline>

Rather than setting an environment variable.

Regards,
Daniel
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RE: Disabling mergeable rx buffers for the guest

[Naor Shlomo]

Paolo,

Thanks for your help in this matter. Issue is resolved.

One more thing I changed in order to get the machine up and running is this:
<domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
has been changed to:
<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>

I verified by running:
cat /sys/bus/virtio/devices/virtio0/features

That the 15th bit is off hence mergeable buffers are disabled.

Thanks again,
Naor


-----Original Message-----
From: kvm-owner@vger.kernel.org [mailto:kvm-owner@vger.kernel.org] On Behalf Of Naor Shlomo
Sent: Tuesday, July 16, 2013 2:06 PM
To: Paolo Bonzini
Cc: kvm@vger.kernel.org
Subject: RE: Disabling mergeable rx buffers for the guest

Paolo, 

Sorry for all the trouble.
We got a progress. Your last qemu:commandline really worked and I was able to try and start the machine.
The problem is that I reached up to the tun driver load section and then the machine shut itself down.

The last lines of the console showed the following:

[    1.568226] Fixed MDIO Bus: probed
[    1.568833] tun: Universal TUN/TAP device driver, 1.6
[    1.569108] tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>

And it got me back to the virsh command line.

Here's an output of the log file:

LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-1.0 -no-kvm -m 2069 -smp 1,sockets=1,cores=1,threads=1 -name NaorDev -uuid 60b5a0ab-8932-47c1-8674-760c7e1f4743 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/NaorDev.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -drive file=/var/lib/libvirt/images/NaorDev.img,if=none,id=drive-virtio-disk0,format=raw,cache=writeback -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive file=/var/lib/libvirt/images/NaorAddonHdd.qcow,if=none,id=drive-virtio-disk1,format=qcow2,cache=none -device virtio-blk-pci,bus=pci.0,addr=0x8,drive=drive-virtio-disk1,id=virt
 io-disk1 -netdev tap,fd=18,id=hostnet0,vhost=on,vhostfd=19 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:c6:b7:a3,bus=pci.0,addr=0x3 -netdev tap,fd=20,id=hostnet1,vhost=on,vhostfd=21 -device virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:00:9e:44:90,bus=pci.0,addr=0x4 -netdev tap,fd=22,id=hostnet2,vhost=on,vhostfd=23 -device virtio-net-pci,netdev=hostnet2,id=net2,mac=52:54:00:e7:f9:bf,bus=pci.0,addr=0x7 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc 127.0.0.1:0 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -global virtio-net-pci.mrg_rxbuf=off Domain id=9 is tainted: custom-argv char device redirected to /dev/pts/1
2013-07-16 12:48:26.440+0000: shutting down

and here's the output of lsmod:

vhost_net              32360  0 
macvtap                18529  1 vhost_net
macvlan                19003  1 macvtap
ip6table_filter        12816  0 
ip6_tables             27686  1 ip6table_filter
ebtable_nat            12808  0 
ebtables               31024  1 ebtable_nat
ipt_MASQUERADE         12760  3 
iptable_nat            13230  1 
nf_nat                 25646  2 ipt_MASQUERADE,iptable_nat
nf_conntrack_ipv4      14531  4 iptable_nat,nf_nat
nf_defrag_ipv4         12730  1 nf_conntrack_ipv4
xt_state               12579  1 
nf_conntrack           83300  5 ipt_MASQUERADE,iptable_nat,nf_nat,nf_conntrack_ipv4,xt_state
ipt_REJECT             12577  2 
xt_CHECKSUM            12550  1 
iptable_mangle         12735  1 
xt_tcpudp              12604  5 
iptable_filter         12811  1 
ip_tables              27474  3 iptable_nat,iptable_mangle,iptable_filter
x_tables               29892  12 ip6table_filter,ip6_tables,ebtables,ipt_MASQUERADE,iptable_nat,xt_state,ipt_REJECT,xt_CHECKSUM,iptable_mangle,xt_tcpudp,iptable_filter,ip_tables
dm_crypt               23126  0 
coretemp               13642  0 
kvm_intel             137888  0 
kvm                   422160  1 kvm_intel
ext2                   73799  1 
gpio_ich               13384  0 
dm_multipath           23306  0 
scsi_dh                14589  1 dm_multipath
lp                     17800  0 
microcode              23030  0 
parport                46563  1 lp
bridge                 91498  0 
sb_edac                18104  0 
stp                    12977  1 bridge
llc                    14598  2 bridge,stp
joydev                 17694  0 
edac_core              53053  3 sb_edac
shpchp                 37278  0 
lpc_ich                17145  0 
mei                    41410  0 
acpi_power_meter       18124  0 
mac_hid                13254  0 
btrfs                 781017  0 
zlib_deflate           27140  1 btrfs
libcrc32c              12645  1 btrfs
vesafb                 13846  1 
hid_generic            12541  0 
usbhid                 47259  0 
hid                   100815  2 hid_generic,usbhid
ses                    17418  0 
enclosure              15313  1 ses
ghash_clmulni_intel    13221  0 
aesni_intel            51134  0 
cryptd                 20531  2 ghash_clmulni_intel,aesni_intel
aes_x86_64             17256  1 aesni_intel
megaraid_sas           82737  2 
ixgbe                 184924  0 
dca                    15233  1 ixgbe
mdio                   13808  1 ixgbe
tg3                   156594  0 
wmi                    19257  0

I will appreciate it if you tell me what I am missing now.

Thanks,
Naor

-----Original Message-----
From: Paolo Bonzini [mailto:pbonzini@redhat.com]
Sent: Tuesday, July 16, 2013 1:42 PM
To: Naor Shlomo
Cc: kvm@vger.kernel.org
Subject: Re: Disabling mergeable rx buffers for the guest

Il 16/07/2013 12:40, Naor Shlomo ha scritto:
> Hi Paolo,
> 
> For some unknown reason it suddenly started to accept the changes to the XML and the strings you gave me are now in place.

Good.

> Upon machine start I now receive the following error messages:
> 
> virsh # start NaorDev
> error: Failed to start domain NaorDev
> error: internal error Process exited while reading console log output: kvm: -global: requires an argument"
> 

That's because I cut-and-pasted without reading:

>   <qemu:commandline>
>     <qemu:arg value='-global'/>
>     <qemu:env name='mrg_rxbuf' value='off'/>
>   </qemu:commandline>

The right one is (or at this point I'd better say "should be"):

   <qemu:commandline>
     <qemu:arg value='-global'/>
     <qemu:arg value='virtio-net-pci.mrg_rxbuf=off'/>
   </qemu:commandline>

Paolo

> </domain>
> 
> Naor
> 
> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
> Sent: Tuesday, July 16, 2013 12:36 PM
> To: Naor Shlomo
> Cc: kvm@vger.kernel.org
> Subject: Re: Disabling mergeable rx buffers for the guest
> 
> Il 16/07/2013 10:06, Naor Shlomo ha scritto:
>> Thanks again Paolo,
>>
>> I used your string and read the documents in the site you referred me to but could not understand why doesn't it accept the xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0' string.
>>
>> I tried it on the following version:
>> Compiled against library: libvir 0.9.8 Using library: libvir 0.9.8 
>> Using API: QEMU 0.9.8 Running hypervisor: QEMU 1.0.0
>>
>> So according to the site it should be supported.
>>
>> Any idea what am I missing now?
> 
> Not sure.  Can you post here the full XML, and the one you're trying to use?
> 
> Paolo
> 
>> Naor
>>
>> -----Original Message-----
>> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
>> Sent: Tuesday, July 16, 2013 9:42 AM
>> To: Naor Shlomo
>> Cc: kvm@vger.kernel.org
>> Subject: Re: Disabling mergeable rx buffers for the guest
>>
>> Il 16/07/2013 08:40, Naor Shlomo ha scritto:
>>> Hi Paolo and thanks for your quick reply,
>>>
>>> I tried editing (virsh edit) the domain's XML and put the XML excerpt you gave me everywhere but with no success.
>>> The moment I exit the edit mode the text was gone (I guess it didn't pass some sort of sanity and that's why it was automatically erased).
>>>
>>> What am I doing wrong?
>>
>> My fault.  You need to change the <domain> opening tag to
>>
>> <domain type='qemu' 
>> xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
>>
>> See http://libvirt.org/drvqemu.html#qemucommand for the docs.
>>
>> Paolo
>>
> 

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