tcpdump mailing list archives
Re: Odd behaviour under Linux 2.6.21
From: James Healy <jhealy () swin edu au>
Date: Sat, 07 Jul 2007 13:07:29 +1000
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Gianluca Varenni wrote:
I guess it's some sort of TCP offloading done at the board level. The driver sends big frames (>1500bytes) to the NIC card, and the NIC card is responsible from creating smaller segments that are sent over the wire. I've seen a similar behavior on Windows with some gigabit network cards (if i remember well at least with some broadcom chipsets).
Spot on. I just had my first encounter with TSO. 2.6.17 was the first kernel where TSO was enabled by default for my nic (tg3 driver). Thanks for the pointer. James -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGjwNx4oawkrbYo/kRApAmAJ4i3HGH/hJdtexYVSzQr2wMDyZmVQCdEYrg HX3bVRwbXPT1qVgMlnzFs78= =YkCC -----END PGP SIGNATURE----- Swinburne University of Technology CRICOS Provider Code: 00111D NOTICE This e-mail and any attachments are confidential and intended only for the use of the addressee. They may contain information that is privileged or protected by copyright. If you are not the intended recipient, any dissemination, distribution, printing, copying or use is strictly prohibited. The University does not warrant that this e-mail and any attachments are secure and there is also a risk that it may be corrupted in transmission. It is your responsibility to check any attachments for viruses or defects before opening them. If you have received this transmission in error, please contact us on +61 3 9214 8000 and delete it immediately from your system. We do not accept liability in connection with computer virus, data corruption, delay, interruption, unauthorised access or unauthorised amendment. Please consider the environment before printing this email. - This is the tcpdump-workers list. Visit https://cod.sandelman.ca/ to unsubscribe.
Current thread:
- Odd behaviour under Linux 2.6.21 James Healy (Jul 05)
- Re: Odd behaviour under Linux 2.6.21 James Healy (Jul 05)
- Re: Odd behaviour under Linux 2.6.21 Gianluca Varenni (Jul 05)
- Re: Odd behaviour under Linux 2.6.21 James Healy (Jul 06)
- Re: Odd behaviour under Linux 2.6.21 Gianluca Varenni (Jul 05)
- Re: Odd behaviour under Linux 2.6.21 James Healy (Jul 05)