4 ms·

The NICs need supported hardware timestamping. Then they can be used with ptp4l. Intel i210 and i226 does this. But the i226 has a few variants.

simoncion 5mo ago
> The NICs need supported hardware timestamping. Yes. I'm aware. Perhaps I'm more stupid about this topic than normal, but it looks to me like the NICs I have do (NIC names have been changed for clarity, but all other output is untouched): $ ethtool -T intel-nic Time stamping parameters for intel-nic: Capabilities: hardware-transmit software-transmit hardware-receive software-receive software-system-clock hardware-raw-clock Hardware timestamp provider index: 0 Hardware timestamp provider qualifier: Precise (IEEE 1588 quality) Hardware timestamp source: MAC Hardware Transmit Timestamp Modes: off on Hardware Receive Filter Modes: none all $ ethtool -T brcm-nic Time stamping parameters for brcm-nic: Capabilities: hardware-transmit software-transmit hardware-receive software-receive software-system-clock hardware-raw-clock Hardware timestamp provider index: 0 Hardware timestamp provider qualifier: Precise (IEEE 1588 quality) Hardware timestamp source: MAC Hardware Transmit Timestamp Modes: off on Hardware Receive Filter Modes: none ptpv1-l4-event ptpv2-l4-event ptpv2-l2-event
- geerlingguy 5mo ago
  Intel's drivers are notoriously annoying as the parent of the parent comment suggests. It seems to be a mix of hardware bugs and a driver that doesn't properly account for them. I know many who've moved to ASIX, Mellanox, and other chipsets just because they don't get weird behaviors or two edges per pulse without hacking the driver.
  - simoncion 5mo ago
    > It seems to be a mix of hardware bugs and a driver that doesn't properly account for them. ~~yaaaaay~~ Also, who the heck knows if my switches are behaving correctly? I may be dealing with a system with multiple failing components. I'd never considered Mellanox hardware... I'd always thought of them as "super expensive datacenter hardware", but non-Infiniband cards I can see on Newegg aren't entirely-unreasonably priced. (TBD if I can find a PCI-E 2.0 1x card, though). I'd not heard of ASIX, and they have a card that would fit in my slot, but -sadly- no in-tree driver. It looks like the only in-tree driver is for a 100mbit card... the AX88796C. Anyway, thanks for the advice/info and the mention of more-reliable manufacturers.

simoncion 5mo ago

> The NICs need supported hardware timestamping. Yes. I'm aware. Perhaps I'm more stupid about this topic than normal, but it looks to me like the NICs I have do (NIC names have been changed for clarity, but all other output is untouched): $ ethtool -T intel-nic Time stamping parameters for intel-nic: Capabilities: hardware-transmit software-transmit hardware-receive software-receive software-system-clock hardware-raw-clock Hardware timestamp provider index: 0 Hardware timestamp provider qualifier: Precise (IEEE 1588 quality) Hardware timestamp source: MAC Hardware Transmit Timestamp Modes: off on Hardware Receive Filter Modes: none all $ ethtool -T brcm-nic Time stamping parameters for brcm-nic: Capabilities: hardware-transmit software-transmit hardware-receive software-receive software-system-clock hardware-raw-clock Hardware timestamp provider index: 0 Hardware timestamp provider qualifier: Precise (IEEE 1588 quality) Hardware timestamp source: MAC Hardware Transmit Timestamp Modes: off on Hardware Receive Filter Modes: none ptpv1-l4-event ptpv2-l4-event ptpv2-l2-event

geerlingguy 5mo ago
Intel's drivers are notoriously annoying as the parent of the parent comment suggests. It seems to be a mix of hardware bugs and a driver that doesn't properly account for them. I know many who've moved to ASIX, Mellanox, and other chipsets just because they don't get weird behaviors or two edges per pulse without hacking the driver.
- simoncion 5mo ago
  > It seems to be a mix of hardware bugs and a driver that doesn't properly account for them. ~~yaaaaay~~ Also, who the heck knows if my switches are behaving correctly? I may be dealing with a system with multiple failing components. I'd never considered Mellanox hardware... I'd always thought of them as "super expensive datacenter hardware", but non-Infiniband cards I can see on Newegg aren't entirely-unreasonably priced. (TBD if I can find a PCI-E 2.0 1x card, though). I'd not heard of ASIX, and they have a card that would fit in my slot, but -sadly- no in-tree driver. It looks like the only in-tree driver is for a 100mbit card... the AX88796C. Anyway, thanks for the advice/info and the mention of more-reliable manufacturers.