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Subject: Re: [Intel-wired-lan] [PATCH iwl-next v4] igb: Retrieve Tx timestamp from BH workqueue X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 3/4/2026 1:35 AM, Miroslav Lichvar wrote: > On Tue, Mar 03, 2026 at 02:38:11PM +0100, Kurt Kanzenbach wrote: >>> It would be great, if you shared the numbers. Did Miroslav already test >>> this? >> >> Great question. I did test with ptp4l and synchronization looks fine < >> below 10ns back to back as expected. I did not test with ntpperf, >> because I was never able to reproduce the NTP regression to the same >> extent as Miroslav reported. Therefore, Miroslav is on Cc in case he >> wants to test it. Let's see. > > I ran the same test with I350 as before and there still seems to be a > regression, but interestingly it's quite different to the previous versions of > the patch. It's like there is a load-sensitive on/off switch. > Could you help me understand this data? I think I've been confused every time I've looked at this. You mention a load sensitive on/off switch... Which i guess kind of makes sense with the numbers here: > Without the patch: > > | responses | response time (ns) > rate clients | lost invalid basic xleave | min mean max stddev > 150000 15000 0.00% 0.00% 0.00% 100.00% +4188 +36475 +193328 16179 > 157500 15750 0.02% 0.00% 0.02% 99.96% +6373 +42969 +683894 22682 > 165375 16384 0.03% 0.00% 0.00% 99.97% +7911 +43960 +692471 24454 > 173643 16384 0.06% 0.00% 0.00% 99.94% +8323 +45627 +707240 28452 > 182325 16384 0.06% 0.00% 0.00% 99.94% +8404 +47292 +722524 26936 > 191441 16384 0.00% 0.00% 0.00% 100.00% +8930 +51738 +223727 14272 > 201013 16384 0.05% 0.00% 0.00% 99.95% +9634 +53696 +776445 23783 > 211063 16384 0.00% 0.00% 0.00% 100.00% +14393 +54558 +329546 20473 > 221616 16384 2.59% 0.00% 0.05% 97.36% +23924 +321205 +518192 21838 > 232696 16384 7.00% 0.00% 0.10% 92.90% +33396 +337709 +575661 21017 > 244330 16384 10.82% 0.00% 0.15% 89.03% +34188 +340248 +556237 20880 > This is without patch, and the "lost" is 0% for low rates, and we have a lower response time mean, max, and standard deviation... But xleave is 100% > With the patch: > 150000 15000 5.11% 0.00% 0.00% 94.88% +4426 +460642 +640884 83746 > 157500 15750 11.54% 0.00% 0.26% 88.20% +14434 +543656 +738355 30349 > 165375 16384 15.61% 0.00% 0.31% 84.08% +35822 +515304 +833859 25596 > 173643 16384 19.58% 0.00% 0.37% 80.05% +20762 +568962 +900100 28118 > 182325 16384 23.46% 0.00% 0.42% 76.13% +41829 +547974 +804170 27890 > 191441 16384 27.23% 0.00% 0.46% 72.31% +15182 +557920 +798212 28868 > 201013 16384 30.51% 0.00% 0.49% 69.00% +15980 +560764 +805576 29979 > 211063 16384 0.06% 0.00% 0.00% 99.94% +12668 +80487 +410555 62182 > 221616 16384 2.94% 0.00% 0.05% 97.00% +21587 +342769 +517566 23359 > 232696 16384 6.94% 0.00% 0.10% 92.96% +16581 +336068 +484574 18453 > 244330 16384 11.45% 0.00% 0.14% 88.41% +23608 +345023 +564130 19177 > With the fix, we have a higher lost percentage, which sounds bad to me..? And we have a higher response time (which also sounds bad??) and we have a much worse standard deviation across all the values from low to high rate. I guess I just don't understand what these numbers mean and why its "better" with the patch. Perhaps its the naming? Or perhaps "xleave" is bad, and this is showing that with the patch we get less of that? But that looks like it gets consistently lower as the rate and number of clients goes up. > At 211063 requests per second and higher the performance looks the > same. But at the lower rates there is a clear drop. The higher > mean response time (difference between server TX and RX timestamps) > indicates more of the provided TX timestamps are hardware timestamps > and the chrony server timestamp statistics confirm that. > So you're saying a higher mean response time is.. better? What is it really measuring then? Oh. I see. it has a higher response time because it takes longer to get a Tx timestamp, but the provided timestamp is higher quality. While previously it was using software timestamps so it could reply faster (since it takes less time to get the software timestamp back out) but the quality is lower? Ok. That makes a bit more sense... > So, my interpretation is that like with the earlier version of the > patch it's trading performance for timestamp quality at lower rates, > but unlike the earlier version it's not losing performance at the > higher rates. That seems acceptable to me. Admins of busy servers > might need to decide if they should keep HW timestamping enabled. In > theory, chrony could have an option to do that automatically. > > Thanks, >