ixl 40G bad performance?

[Eggert, Lars]

On 2015-10-22, at 9:38, Eggert, Lars <lars at netapp.com> wrote:
> for those of you following along, I did try jumbograms and throughput increases roughly 5x. So it looks like I'm hitting a packet-rate limit somewhere.

Does the ixl driver have an issue with TSO/LRO?

If I tcpdump on the receiver when testing the 10G ix interfaces, I see that most "packets" are up to 64KB in the traces on both sender and receiver, which is expected with TSO/LRO.

When I look at the traffic over the ixl interfaces, I see that most "packets" on the sender are much smaller (~2896 aka 2 segments; although some few are >40K). On the receiver, I only see 1448 byte packets.

Lars
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 273 bytes
Desc: Message signed with OpenPGP using GPGMail
URL: <http://lists.freebsd.org/pipermail/freebsd-net/attachments/20151022/56ed9f7c/attachment.bin>