RE: Disabling mergeable rx buffers for the guest

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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@xxxxxxxxxxxxxxx [mailto:kvm-owner@xxxxxxxxxxxxxxx] On Behalf Of Naor Shlomo
Sent: Tuesday, July 16, 2013 2:06 PM
To: Paolo Bonzini
Cc: kvm@xxxxxxxxxxxxxxx
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@xxxxxxxxxxxx>

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=virtio-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@xxxxxxxxxx]
Sent: Tuesday, July 16, 2013 1:42 PM
To: Naor Shlomo
Cc: kvm@xxxxxxxxxxxxxxx
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@xxxxxxxxxx]
> Sent: Tuesday, July 16, 2013 12:36 PM
> To: Naor Shlomo
> Cc: kvm@xxxxxxxxxxxxxxx
> 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@xxxxxxxxxx]
>> Sent: Tuesday, July 16, 2013 9:42 AM
>> To: Naor Shlomo
>> Cc: kvm@xxxxxxxxxxxxxxx
>> 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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