On Mon, May 06, 2024 at 10:34:22AM +0800, Michael Chang via Grub-devel wrote: > When grub image is netbooted on ppc64le, the keyboard input exhibits > significant latency, reports even say that characters are processed > about once per second. This issue makes interactively trying to debug a > ppc64le config very difficult. > > It seems that the latency is largely caused by a 200 ms timeout in the > idle event loop, during which the network card interface is consistently > polled for incoming packets. Often, no packets arrive during this > period, so the timeout nearly always expires, which blocks the response > to key inputs. > > Furthermore, this 200 ms timeout might not need to be enforced at this > basic layer, considering that grub performs synchronous reads and its > timeout management is actually handled by higher layers, not directly in > the card instance. Additionally, the idle polling, which reacts to > unsolicited packets like ICMP and SLAAC, would be fine at a less > frequent polling interval, rather than needing a timeout for receiving a > response. > > For these reasons, we believe the timeout in get_card_packet should be > effectively removed. According to test results, the delay has > disappeared, and it is now much easier to use interactively. > > Signed-Off-by: Michael Chang <mch...@suse.com> > Tested-by: Tony Jones <to...@suse.com>
Reviewed-by: Daniel Kiper <daniel.ki...@oracle.com> Daniel _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
