Hardware as requested:
Platform: Intel S2600WF
Affected cpu 6130, 6130T
Various nic's all connected to socket 2
Same platform with 5122 and 6134 seems to work fine.
Kernel params for 6130:
intel_iommu=on iommu=pt isolcpus=16-31,48-63 nohz_full=16-31,48-63
rcu_nocbs=16-31,48-63 hugepagesz=1GB hugepages=16
vpp runs on 16-19,48-51 with master running on 31
If I add "notsc clocksource=hpet" the problem is less pronounced.
But, what I'm asking about is the code itself - seems wrong. The hardware
just brings the problem forth much more frequently.
I've added a few prints to see how the values change over time, and
c->clocks_per_second while mostly stable tends to change now and again
(210000 vs 209000 in my case).
This leads to "now" jumping backward and forward, if the jump happens in
specific moment, like (maybe only?) when vm->barrier_no_close_before is
set, vpp will stall for some time or throw assert.
The code as it is now, relies on clock parameters not to change
frequently, or at all, while in fact it can change (and vpp calls
clib_time_verify_frequency for exactly this purpose).
I hope this makes sense.
W dniu 24.02.2018 o 14:19 Dave Barach <dbar...@cisco.com> pisze:
If you don't describe the "specific hardware configuration," we can't
help you.
-----Original Message-----
From: vpp-dev@lists.fd.io [mailto:vpp-dev@lists.fd.io] On Behalf Of
Konrad Gutkowski
Sent: Friday, February 23, 2018 9:10 PM
To: vpp-dev@lists.fd.io
Subject: [vpp-dev] clib_time_now
Hi,
If I'm reading this correctly clib_time_verify_frequency takes into
considetation only recent tick's, while the result is applied to the
total number of tick's since program start.
From what I saw, in normal circumstances with cpu speed scaling it will
very rarely lead to main thread stalling.
With some specific hardware configuration it makes vpp almost inoperable.
Thanks,
--
Konrad Gutkowski
--
--
Konrad Gutkowski
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