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05-13-2008, 06:09 PM
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 TCP checksum HP-UX B.11.23 ia64 How can we know if the TCP checksum is done by HW (the used NIC) or by software? Alex Vinokur email: alex DOT vinokur AT gmail DOT com http://mathforum.org/library/view/10978.html http://sourceforge.net/users/alexvn      |
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05-13-2008, 06:09 PM
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| Re: TCP checksum Alex Vinokur <alexvn@users.sourceforge.net> wrote: > HP-UX B.11.23 ia64 > How can we know if the TCP checksum is done by HW (the used NIC) or > by software? That would I suspect be via some lanadmin command. More broadly, a while back, HP-UX stopped enabling CKO (ChecKsum Offload) on 1G links by default. It will enable it on 10G links by default. The last time I checked IB, none of the IB links out there even offered CKO, but that may have changed, although I don't know if that would have been reflected in the offerings for the Integrity servers running HP-UX. Also, if you were to use caliper <http://www.hp.com/go/caliper> to profile the system you could see or not see the checksum routines being called and consuming non-epsilon quantities of CPU time. rick jones -- denial, anger, bargaining, depression, acceptance, rebirth... where do you want to be today? these opinions are mine, all mine; HP might not want them anyway...  feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH... |
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05-24-2008, 06:02 AM
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| Re: TCP checksum On May 12, 2:55 pm, Alex Vinokur <ale...@users.sourceforge.net> wrote: > HP-UX B.11.23 ia64 > > How can we know if the TCP checksum is done by HW (the used NIC) or by > software? > Check the value of `flags' in the output of `ifconfig' on the interface you're interested in. If you see `CKO', the hardware is doing TCP/IP checksum calculation; if not, the software stack is. Mathen |
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05-29-2008, 09:32 AM
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| Re: TCP checksum Rick Jones <rick.jones2@hp.com> writes: > Alex Vinokur <alexvn@users.sourceforge.net> wrote: >> HP-UX B.11.23 ia64 > >> How can we know if the TCP checksum is done by HW (the used NIC) or >> by software? > > That would I suspect be via some lanadmin command. Assuming "latest technology" form HP, the suggested command should be "nwmgr -g --st -c btlan" (or so). As an interesting note: While HP docs say that lanadmin and comparables are considered obsolete, their current VLAN configuration script still uses lanadmin instead of nwmgr. ;-) > > More broadly, a while back, HP-UX stopped enabling CKO (ChecKsum > Offload) on 1G links by default. It will enable it on 10G links by > default. The last time I checked IB, none of the IB links out there > even offered CKO, but that may have changed, although I don't know if > that would have been reflected in the offerings for the Integrity > servers running HP-UX. > > Also, if you were to use caliper <http://www.hp.com/go/caliper> to > profile the system you could see or not see the checksum routines > being called and consuming non-epsilon quantities of CPU time. > > rick jones > -- > denial, anger, bargaining, depression, acceptance, rebirth... > where do you want to be today? > these opinions are mine, all mine; HP might not want them anyway... > feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH... |
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