[Xen-users] hvm pxe boot - tftp fails to transfer files larger than 2 blocks

[Bruce Edge <bruce.edge@xxxxxxxxx>]

The tftp transfer is only transferring the first 2 blocks of the request file.
I'm running tftpd-hpa on the server side and xen 4.0.1-rc3-pre with
2.6.32x pv-ops on the client side.

At first I was stuck here:

[PXE]Hunting for pixies...found !PXE at 0009ce60...ok
configfile: (nd)/import/tools/pxe/kaan-22-dpm/menu.lst
bootp called in PXE TFTP mode
dhcp called in PXE TFTP mode

I ran wireshark on dom0 with a capture filter for the domU's MAC.

It showed that the menu.lst was not being completely transfered. Only
the first half, which were mostly comments were making onto the wire.
Stripping out all the comments got me as far as a grub menu:

   GNU GRUB  version 0.97-os.6  (626K lower / 3143300K upper memory)

 +-------------------------------------------------------------------[0]---+
 | kernel /import/bedge/root/boot/vmlinu>  |
 | initrd /import/bedge/root/boot/initrd>  |
 |                                                                         |
 |                                                                         |
 |                                                                         |
 |                                                                         |
 |                                                                         |
 |                                                                         |
 |                                                                         |
 |                                                                         |
 |                                                                         |
 |                                                                         |
 +-------------------------------------------------------------------------+
   Press 'b' to boot, 'e' to edit the selected command in the
      boot sequence, 'c' for a command-line, 'o' to open a new line
      after ('O' for before) the selected line, 'd' to remove the
      selected line, '/?nN' to search, or escape to go back to the main menu.

Then when the boot started, the same problem with the file transfer
happened, 2 blocks and then nothing.

Wireshark shows that the tftp client, the domU, never sends more than
2 Acks, so the tftp server keeps sending the 3rd packet and eventually
gives up.

This is the same behavior with the menu.lst file. which I was able to
shorten to fit into 2 blocks, and in the kernel, which I cannot.

One last clue that may or may not have anything to do with this is
that after the transfer has time out, the tftp server starts sending
our ARP requests for the domU.

Does anyone have any suggestions?

Should I try chainloading gPXE ad http boot?

Or, is there some other way to transfer the kernel for an hvm domU?

Here's the complete wireshark trace for the failed kernel transfer:

    268 31.190226   kaan-22-dpm.lsi.com   wlvdev.lsi.com        TFTP
  Read Request, File: import/bedge/root/boot/vmlinuz-2.6.32.15\000,
Transfer type: octet\000
    269 31.198000   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Option Acknowledgement
    270 31.198278   kaan-22-dpm.lsi.com   wlvdev.lsi.com        TFTP
  Acknowledgement, Block: 0
    271 31.198524   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 1
    272 31.198809   kaan-22-dpm.lsi.com   wlvdev.lsi.com        TFTP
  Acknowledgement, Block: 1  <- this is the last ack sent, so there is
no more data from the server.
    273 31.201631   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 2
    274 31.937849   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 1
    275 32.197838   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 2
    276 33.141874   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 1 (last)
    277 33.937870   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 1
    278 34.197800   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 2
    279 37.937912   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 1
    280 38.197905   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 2
    281 45.937950   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 1
    282 46.197921   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 2
    283 61.938034   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 1
    284 62.198076   wlvdev.lsi.com        kaan-22-dpm.lsi.com   TFTP
  Data Packet, Block: 2
    285 66.937967   135.149.78.198        kaan-22-dpm.lsi.com   ARP
  Who has 135.149.77.123?  Tell 135.149.78.198
    286 67.937945   135.149.78.198        kaan-22-dpm.lsi.com   ARP
  Who has 135.149.77.123?  Tell 135.149.78.198
    287 68.937940   135.149.78.198        kaan-22-dpm.lsi.com   ARP
  Who has 135.149.77.123?  Tell 135.149.78.198


-Bruce

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