Is it a cut-through switch?
> On Jan 29, 2018, at 08:17, Thibaut BEYLER <thibautbey...@gmail.com> wrote: > > Hello, > > We have chrony 3.2 clients on 5 sites, each synchronised with 3 sources : > • Source 1 : An high performance asic-based ntp server with server-side > hw timestamping > • Source 2 : A 'backup' software-based ntp server > • Source 3 : A (shitty) linux ntpd > Source 1 & 2 are from a stratum 1 time server deployed on each site. > > All our client run on a recent kernel and have nics that have at least TX hw > timestamping features, timestamping should be at least hardware/kernel. In > this mode, peer delay is around 12us normally with source 1 (only 1 switch > between the clients and the timeserver) > > I recently investigated some server on a site that struggle to use HW > timestamp and spend most of their time in deamon/deamon mode instead of > hardware/kernel. The weird part is that it occurs only with source 1, the > client kernels are stable with hw/kernel on the less acurate sources. > > Turns out I have this problem only with my high performance source, the > 'slower' sources being fine. > > Running chrony in debug mode i have messages such as > > 2018-01-26T16:46:26Z sys_linux.c:755:(get_precise_phc_sample) > ioctl(PTP_SYS_OFFSET_PRECISE) failed : Operation not supported > 2018-01-26T16:46:26Z hwclock.c:171:(HCL_AccumulateSample) HW clock needs more > samples > 2018-01-26T16:46:26Z ntp_io_linux.c:653:(NIO_Linux_ProcessMessage) Received > 90 (48) bytes from error queue for 10.214.16.11:123 fd=13 if=2 tss=0 > 2018-01-26T16:46:26Z ntp_io_linux.c:665:(NIO_Linux_ProcessMessage) Missing TX > timestamp > > > I tried to run chrony in debug mode in another site where I have no problems > to compare the logs, but when i run chronyd as root (debug mode or not) with > the exact same command that systemd launches it, then I have the exact same > problem (timestamp reported deamon/deamon with source 1 and fine with the > others) > > Any leads ? > > > -- To unsubscribe email chrony-users-requ...@chrony.tuxfamily.org with "unsubscribe" in the subject. For help email chrony-users-requ...@chrony.tuxfamily.org with "help" in the subject. Trouble? Email listmas...@chrony.tuxfamily.org.
