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[10:44:54] <tsoome> jbk that sounds like it should be configurable...
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[15:36:53] <KungFuJesus> jbk: Yeah, I think with ZoL they let you force it in sysfs somewhere
[15:37:27] <KungFuJesus> But yeah AVX512 is going to be iffy, mostly because the context swap, if the IO is heavy, might end up giving you a clock penalty that hurts
[15:39:59] <KungFuJesus> I don't know that Intel is going to have to have the clock penalty until the end of time for AVX512, but I wonder if the sane thing to do is to see if the CPU has already been power gated due to AVX512 instructions and only use the AVX512 variants if that's true
[15:40:39] <KungFuJesus> From what I understand figuring that out might be impossible, though. Is the clock penalty conveyed in MSRs anywhere or is it entirely opaque within the micro architecture?
[15:42:00] <KungFuJesus> jbk: also isn't the kfpu stuff integrated? It looked like it was
[15:43:16] <KungFuJesus> err, maybe jerry just integrated the stubs
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[16:40:21] <jbk> KungFuJesus: not yet -- it's still out for review, but getting close
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[16:40:57] <jbk> tsoome: well for now, he isn't going to port the avx512 stuff (because of the often unwanted side effects)
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[16:52:25] <tsoome> makes sense
[16:58:42] <jbk> but i guess the question is if someone can think of a better way -- we can certainly add tunables to override things, but they're supposed to be for exceptional cases or diagnostics
[16:59:01] <jbk> a user shouldn't have to mess w/ tunables just to get a system working decently
[16:59:11] <jbk> (at least that's my view on it)
[17:00:16] <tsoome> yes tunables are often evil, but unfortunately there are situations we can not tune automatically..
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[17:17:27] <igork> jbk: +1 for tuable way
[17:17:41] <igork> *tunable
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[19:40:07] <gitomat> [illumos-gate] 12836 loader: strings in nvlist are counted strings, not c-strings -- Toomas Soome <tsoome at me dot com>
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[19:47:31] <gitomat> [illumos-gate] 12824 recvmsg(): adjust final cmsg->cmsg_len upon MSG_CTRUNC -- Andy Fiddaman <omnios at citrus-it dot co.uk>
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[22:20:34] <gitomat> [illumos-gate] 12541 sgs: smatch and NULL pointer errors -- Toomas Soome <tsoome at me dot com>
[22:43:44] <KungFuJesus> jbk: If the userspace applications already running happened to already be downclocked for AVX512 code, then there's no penalty
[22:43:57] <KungFuJesus> I'm wondering if there's a good way to signal that to the kernel
[22:44:18] <KungFuJesus> probably is, the kernel has to know for the sake of preserving the register state
[22:48:59] <rmustacc> Almost all ZIO processing is done in kernel-thread context.
[22:49:22] <rmustacc> As in the user thread generally doesn't matter except for maybe 0.1% of the time.
[22:49:44] <rmustacc> However, when saving and restoring it, it is possible to know about the current thread; however, that doesn't tell you anything about the twin.
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[23:22:44] <KungFuJesus> back to SMT issues :-p
[23:23:00] <sjorge> rmustacc: you interesteted in ixgbe nic that prints 'unknown' version in fwflash -l after the ufm drop from last week?
[23:24:24] <KungFuJesus> What I was getting at more or less is if the user thread has already used AVX512 instructions for a few clock cycles and hit the clock penalty, the kernel isn't going to introduce an additional one. In this special circumstance, it may even be beneficial to the user thread for the kernel thread to use the AVX512 checksums/parity calculations
[23:25:22] <sjorge> brb, rebooting the other node
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[23:45:59] <rmustacc> sjorge: That's exactly what I expect.
[23:48:27] <rmustacc> sjorge: The eeprom's don't have a version number, unfortunately.
[23:48:41] <rmustacc> But you can now read out the prom, which is useful.
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[23:59:24] <ryoshu> is there woboq index for illumos?
top

   June 19, 2020  
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