Re: PCI passthrough issue

[Jean Baptiste Favre <xen-devel@jbfavre.org>]

Hello,
I made some more tests today, still with 2.6.37 32bits kernel from
Debian experimental, with various memory allocation value.

For each test, I make ping on my gateway with various packet size:
ping -s15 10.0.0.1
ping -s85 10.0.0.1
ping -s86 10.0.0.1
ping -s150 10.0.0.1

Results bellow:

- less than 256mb: works
- between 256 and 512mb: ping greater than 85 bytes does not work
- more than 512mb: works

I'm lost...
Regards,
JB


Le 27/01/2011 22:47, Jean Baptiste Favre a écrit :
> Hello Konrad,
> 
> Le 27/01/2011 21:27, Konrad Rzeszutek Wilk a écrit :
>> On Sat, Jan 22, 2011 at 11:22:59AM +0100, Jean Baptiste Favre wrote:
>>> Hello,
>>> Last investigations show that I've the latest BIOS version for my
>>> motherboard.
>>> Do you need more tests, if yes which ones ?
>>
>> I tried it on my 2.6.32.27 (32-bit and 64-bit) and I am not seeing
>> the failures you have. These are the devices I passed in:
>>
>> 00:00.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 02)
>> 00:00.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 02)
>> 00:00.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 02)
>> 00:00.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 02)
>> 00:01.1 Ethernet controller: Intel Corporation 82575EB Gigabit Network Connection (rev 02)
>> 00:02.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 07)
>> 00:02.1 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 07)
>> 00:03.0 Ethernet controller: Intel Corporation 82572EI Gigabit Ethernet Controller (Copper) (rev 06)
>>
>> Granted the kernel I am using a jeremy/xen/stable-2.6.32.x so not sure
>> how divergent from Debian or Debian Squeeze it is.
>>
>> How are you launching your guest? Do you something like this:
>>
>> kernel="/mnt/lab/2.6.32.27/vmlinuz"
>> ramdisk="/mnt/lab/2.6.32.27/initramfs.cpio.gz"
>> extra="console=hvc0 debug test=crashme iommu=soft"
>> memory=1024
>> maxmem=2048
>> vcpus=4
>> on_crash="preserve"
>> pci= ["00:1d.0","00:1d.1","00:1d.2","00:1d.7","0a:00.1","0000:06:01.1","0000:06:01.0", "09:00.0"]
>> vif = [ 'mac=00:0f:4b:00:00:68, bridge=switch' ]
> 
> Here is my domU config file:
> ####################
> kernel       = '/cluster/kernels/vmlinuz-2.6.37-trunk-686-bigmem'
> ramdisk      = '/cluster/kernels/initrd.img-2.6.37-trunk-686-bigmem'
> builder      = 'linux'
> 
> memory       = '256'
> memory       = '512'
> vcpus        = '1'
> cpus         = '2'
> localtime    = 0
> serial       = 'pty'
> 
> disk         = [ 'drbd:xps-106,xvda,w' ]
> 
> on_poweroff  = 'destroy'
> on_reboot    = 'restart'
> on_crash     = 'restart'
> 
> extra = "root=/dev/mapper/xps--106-root ro iommu=soft swiotlb=force
> console=hvc0 xencons=tty"
> 
> pci = [ '04:00.0' ]
> 
> name         = 'xps-106'
> hostname     = 'xps-106.clichy.jbfavre.org'
> ####################
> 
> As I privately told you, I made the tests you suggested and the result
> is that problem occurs with 256mb of memory, but is solved with 512mb or
> more.
> 
> Basically, what I find surprising is that with 256mb of memory, the max
> size for incoming packets to be blocked is 128 bytes.
> Makes me think about an unsigned integer or something like that, but I
> don't have enough kernel knowledge to be more precise.
> 
> Regards,
> JB
> 
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