Re: [i40e] regression on TCP stream and TCP maerts, kernel-4.12.0-0.rc2

On Wed, May 31, 2017 at 6:48 AM, Adrian Tomasov [off-list ref] wrote:

On Tue, 2017-05-30 at 18:27 -0700, Alexander Duyck wrote:

quoted

On Tue, May 30, 2017 at 8:41 AM, Alexander Duyck
[off-list ref] wrote:

quoted

On Tue, May 30, 2017 at 6:43 AM, Adam Okuliar [off-list ref]
wrote:

quoted

Hello,

we found regression on intel card(XL710) with i40e driver.
Regression is
about ~45%
on TCP_STREAM and TCP_MAERTS test for IPv4 and IPv6. Regression
was first
visible in kernel-4.12.0-0.rc1.

More details about results you can see in uploaded images in
bugzilla. [0]


[0] https://bugzilla.kernel.org/show_bug.cgi?id=195923


Best regards, / S pozdravom,

Adrián Tomašov
Kernel Performance QE
atomasov@redhat.com

I have added the i40e driver maintainer and the intel-wired-lan
mailing list so that we can make are developers aware of the issue.

Thanks.

- Alex

Adam,

We are having some issues trying to reproduce what you reported.

Can you provide some additional data. Specifically we would be
looking
for an "ethtool -i", and an "ethtool -S" for the port before and
after
the test. If you can attach it to the bugzilla that would be
appreciated.

Thanks.

- Alex

Hello Alex,

requested files are updated in bugzilla.

If you have any questions about testing feel free to ask.


Best regards,

Adrian

So looking at the data I wonder if we don't have an MTU mismatch in
the network config. I notice the "after" has rx_length_errors being
reported. Recent changes made it so that i40e doesn't support jumbo
frames by default, whereas before we could. You might want to check
for that as that could cause the kind of performance issues you are
seeing.

- Alex