xen discuss - Jul 2009 - How to disable checksum offloading for OSOL DomU via kmdb at initial boot ?

Adding -kd to extra line drops me to kmdb :-

root@ServerJaunty:/home/boris/nevada# xm create -c osol.install
Using config file "./osol.install".
Started domain osol.install (id=4)
                                  Loading kmdb...
Welcome to kmdb
Loaded modules: [ unix krtld genunix ]
[0]> 

I want patch kernel like it happens when adding to /etc/system:-
set xnf:xnf_cksum_offload = 0
Please, advise how to manage. I forgot. Googling doesn''t help
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::bp xnf`_init
:c
xnf_cksum_offload/W 0
:c

Thank you.
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This message posted from opensolaris.org

* no-reply@opensolaris.org [2009-07-19 10:03:41]
> Adding -kd to extra line drops me to kmdb :-
>
> root@ServerJaunty:/home/boris/nevada# xm create -c osol.install
> Using config file "./osol.install".
> Started domain osol.install (id=4)
>                                   Loading kmdb...
> Welcome to kmdb
> Loaded modules: [ unix krtld genunix ]
> [0]> 
>
> I want patch kernel like it happens when adding to /etc/system:-
> set xnf:xnf_cksum_offload = 0
> Please, advise how to manage. I forgot. Googling doesn''t help
Is this still necessary? What version of OpenSolaris are you using?

dme.
-- 
David Edmondson, Sun Microsystems, http://dme.org

Please, view :-
http://www.nabble.com/Opensolaris-domU-unable-to-get-dhcp-lease-td24554248.html
Through my experience OSOL 2009.06 (SNV_111b) has old bug.
SNV_117 works OK. 
I just cannot test every Nevada build for this issue.
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* no-reply@opensolaris.org [2009-07-20 11:38:32]
> Please, view :-
>
http://www.nabble.com/Opensolaris-domU-unable-to-get-dhcp-lease-td24554248.html
> Through my experience OSOL 2009.06 (SNV_111b) has old bug.
> SNV_117 works OK. 
Ah, okay. If 117 works fine then I''m happy.
> I just cannot test every Nevada build for this issue.
Understood. Thanks for your help.

dme.
-- 
David Edmondson, Sun Microsystems, http://dme.org

In case of successful dhcp lease for OSOL DomU  the tcpdump log captured  on any
other box on the LAN appears to have enties :-

17:21:18.435359 IP (tos 0x0, ttl 255, id 63827, offset 0, flags [DF], proto UDP
(17), length 328) 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok]
BOOTP/DHCP, Request from 00:16:3e:1b:c3:b5 (oui Unknown), length 300, xid
0xc5c170eb, Flags [none] (0x0000)
          Client-Ethernet-Address 00:16:3e:1b:c3:b5 (oui Unknown)
          Vendor-rfc1048 Extensions
            Magic Cookie 0x63825363
            DHCP-Message Option 53, length 1: Discover
            MSZ Option 57, length 2: 1472
            Lease-Time Option 51, length 4: 4294967295
            Vendor-Class Option 60, length 11: "SUNW.i86xpv"
            Parameter-Request Option 55, length 7:
              Subnet-Mask, Default-Gateway, Domain-Name-Server, Hostname
              Domain-Name, BR, Vendor-Option
17:21:18.435427 IP (tos 0x0, ttl 64, id 32888, offset 0, flags [DF], proto UDP
(17), length 66) ServerJaunty.local.55323 > ns.yyyy.xx.domain: [bad udp cksum
114a!] 48715+ PTR? 0.0.0.0.in-addr.arpa. (38)
17:21:18.436895 arp who-has 192.168.1.37 tell 192.168.1.1
17:21:18.437081 arp who-has 192.168.1.38 tell 192.168.1.1
17:21:18.437385 arp who-has 192.168.1.40 tell 192.168.1.1
17:21:18.437583 arp who-has 192.168.1.41 tell 192.168.1.1

. . .  .  .

17:21:22.825307 IP (tos 0x0, ttl 255, id 63828, offset 0, flags [DF], proto UDP
(17), length 328) 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok]
BOOTP/DHCP, Request from 00:16:3e:1b:c3:b5 (oui Unknown), length 300, xid
0xc5c170eb, secs 4, Flags [none] (0x0000)
          Client-Ethernet-Address 00:16:3e:1b:c3:b5 (oui Unknown)
          Vendor-rfc1048 Extensions
            Magic Cookie 0x63825363
            DHCP-Message Option 53, length 1: Discover
            MSZ Option 57, length 2: 1472
            Lease-Time Option 51, length 4: 4294967295
            Vendor-Class Option 60, length 11: "SUNW.i86xpv"
            Parameter-Request Option 55, length 7:
              Subnet-Mask, Default-Gateway, Domain-Name-Server, Hostname
              Domain-Name, BR, Vendor-Option
17:21:23.447516 IP (tos 0x0, ttl 64, id 33390, offset 0, flags [DF], proto UDP
(17), length 71) ServerJaunty.local.53362 > ns.yyyy.xx.domain: [bad udp cksum
bd45!] 24456+ PTR? 37.1.168.192.in-addr.arpa. (43)
17:21:23.569486 IP (tos 0x0, ttl 61, id 47748, offset 0, flags [none], proto UDP
(17), length 148) ns.xxxx.yy.domain > ServerJaunty.local.53362: [udp sum ok]
24456 NXDomain q: PTR? 37.1.168.192.in-addr.arpa. 0/1/0 ns:
168.192.in-addr.arpa. SOA prisoner.iana.org. hostmaster.root-servers.org.
2009020501 1800 900 604800 604800 (120)
17:21:23.669704 IP (tos 0x0, ttl 255, id 0, offset 0, flags [DF], proto UDP
(17), length 71) ServerJaunty.local.mdns > 224.0.0.251.mdns: [bad udp cksum
1d0d!] 0 PTR (QM)? 37.1.168.192.in-addr.arpa. (43)
17:21:24.205153 IP6 (hlim 1, next-header Options (0) payload length: 36)
fe80::216:3eff:fe1b:c3b5 > ff02::16: HBH (rtalert: 0x0000) (pad1)(pad1)[icmp6
sum ok] ICMP6, multicast listener report v2, length 28, 1 group record(s) [gaddr
ff02::1:ff1b:c3b5 to_ex { }]
17:21:24.435430 IP (tos 0x0, ttl 255, id 63829, offset 0, flags [DF], proto UDP
(17), length 328) 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok]
BOOTP/DHCP, Request from 00:16:3e:1b:c3:b5 (oui Unknown), length 300, xid
0xb5ef2191, secs 4, Flags [none] (0x0000)
          Client-Ethernet-Address 00:16:3e:1b:c3:b5 (oui Unknown)
          Vendor-rfc1048 Extensions
            Magic Cookie 0x63825363
            DHCP-Message Option 53, length 1: Request
            Lease-Time Option 51, length 4: 4294967295
            MSZ Option 57, length 2: 1472
            Requested-IP Option 50, length 4: 192.168.1.37
            Server-ID Option 54, length 4: 192.168.1.1
            Vendor-Class Option 60, length 11: "SUNW.i86xpv"
            Parameter-Request Option 55, length 7:


If checksum offloading is disabled via kmdb installer will succeed in 10 from 10
attempts,
otherwise in 1 or 2 from 10 attempts, even worse.
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