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[07:11:52] <rzezeski> Just a heads up: I just sent two RTI emails and subscribed to advocates under my personal email (now that I'm not longer a Joyent employee). If someone could click the necessary buttons when they get a chance that would be appreciated.
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[07:31:43] <sjorge> rzezeski nice to see you're still active. Hope the slopes have been good to you! (Saw some pictures on your twitter)
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[08:51:39] <EisNerd> v_a_b: I'd like to rule out a hardware issue
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[09:33:47] <sensille> is it possible to run a user mode process with prio 60 with priocntl? i can only manage 59 (TS) and 100 (RT)
[09:58:30] <v_a_b> sensille Does priocntl -l display 60?
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[10:10:38] <sensille> it displays 60 for TS but rejects it, "TSpriocntl: Specified user priority 60 exceeds limit 0; set to 0"
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[11:02:07] <v_a_b> But you don't get the messaeg when you run the same command with 59? Strange
[11:06:46] <v_a_b> Just looked at the man page; it's been too long. Not sure if I understand that stuff correctly. But there's also a user priority limit (default 0) that you also need to increase (priocntl -m versus priocntl -p).
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[11:12:57] <sensille> i can get the 59 with nice. anyway, 60-99 is class SYS, which is not available with priocntl
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[11:15:56] <EisNerd> can smeone stop this quakenet trolls?
[11:16:14] <v_a_b> DDOS quakenet? ;-)
[11:17:14] <EisNerd> anyway, I'm going to setup anaction plan to hunt down my nvme ssd performance problem
[11:17:33] <EisNerd> grml, first buy a new keyboard
[11:17:54] <v_a_b> Macbook Pro?
[11:18:57] <EisNerd> no cheap hp boxed
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[11:46:28] <EisNerd> so even with an ubuntu live cd I get 650MB/s from my ssds, so there seems to be sth bad with my OI
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[12:01:35] <v_a_b> EisNerd What did you set ashift to?
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[12:12:51] <EisNerd> I left it orginal on default, but I'll recreate the pool with 12 or is there an even better value?
[12:13:23] <sensille> i'd keep to dd for a start
[12:13:42] <sensille> does a blocksize of 64k vs. 128k makes a difference with dd?
[12:14:15] <sensille> the question is, is that a problem with bandwidth or with latency?
[12:17:04] <EisNerd> buth I would say as I would expect far more from this devices https://business.kioxia.com/de-de/ssd/enterprise-ssd/cm5-r-series.html
[12:18:41] <EisNerd> here is the english version of the page https://business.kioxia.com/en-us/ssd/enterprise-ssd/cm5-r-series.html
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[12:24:09] <EisNerd> dd bs=128k count=65024 => 8522825728 bytes transferred in 44.229200 secs (184MB/sec)
[12:28:42] <EisNerd> are there tunables I could do? as I get on first try bad values and then excellent, looks somehow awkward
[12:35:21] <v_a_b> I only have SATA SSDs but the minimum ashift is 12, I routinely set it to 13 now.
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[12:56:01] <sensille> EisNerd: and 64k?
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[12:56:49] <EisNerd> letme check
[12:58:24] <EisNerd> 8522825728 bytes transferred in 52.871307 secs (154MB/sec)
[13:00:44] <sensille> not as big a difference as i had expected, but still. try 1M
[13:01:01] <sensille> but nevertheless that's too low
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[13:02:44] <EisNerd> https://pastebin.com/3Zt8t2QZ
[13:02:54] <EisNerd> that is quite puzzling
[13:03:41] <EisNerd> note the multiplier at count in the first few tries
[13:04:52] <EisNerd> based on the specs I would expect thefinal results as normal and reproduceable on instant
[13:05:02] <neuroserve> EisNerd : there was a talk about openzfs and l2arc design in the era of nvme (https://bit.ly/2vyZbrP)
[13:05:51] <EisNerd> also a pool based on a raidz2 of 5 of thoose devices should give more than ~1GB per second
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[13:15:21] <EisNerd> neuroserve: nice slides, but not sure if it helps as this is a pure nvme system, so data vdevs should be nvme ssds
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[14:13:26] <EisNerd> not really superior https://pastebin.com/89H9F8VV
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[17:07:40] <rmustacc> Feels nice to finally get this out https://code.illumos.org/c/illumos-gate/+/398/1/usr/src/lib/libc/port/stdio/README.design.
[17:07:50] <rmustacc> (Though I'm sure there are plenty of typos)
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[17:13:27] <jperkin> nice, that'll fix a few things
[17:14:44] <gitomat> [illumos-gate] 12344 zpool iostat output formatting error -- Jerry Jelinek <jerry.jelinek at joyent dot com>
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[17:32:00] <igork> rmustacc: hi, about your libc update - thanks a lot! do you have commits on github for cherry-pick for testing?
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[18:22:23] <rmustacc> igork: No, it's all on code.illumos.org.
[18:29:08] <sensille> is there a reason there's no preemption of kernel threads? the scheduler even pokes the respective cpu when a higher priority threads arrives, but it doesn't act on it
[18:29:45] <rmustacc> There are a couple of different bugs that leads to pre-emption not always working. One of which pmooney has a change out to fix, IIRC.
[18:30:25] <sensille> to me it look like it's just not implemented for kernel threads
[18:31:41] <sensille> #7232 also describes this, but the solution just to hunt down all long-running threads doesn't really satisfies me
[18:32:11] <rmustacc> They have definitely been pre-empted by interrupts. But this does seem odd.
[18:33:13] <sensille> interrupted by interrupts, but did this also lead to a sched()?
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[18:34:17] <sensille> the only point for preemtion i can find is trap(), but there's no path from apix_do_interrupt to trap i can find
[18:34:36] <rmustacc> I'm not sure off hand. In general, when an interrupt occurs we borrow the interrupted threads lwp.
[18:34:45] <rmustacc> It's been a long while since I've looked at this in detail.
[18:35:05] <sensille> sure, but after the interrupt has been serviced, the only thread continues
[18:35:12] <sensille> s/only/old
[18:35:38] <rmustacc> I guess that is right. Weird. I would have thought RT would have still caused pre-emptions there, but I'm not sure.
[18:36:01] <sensille> possibly, i was only looking at sys class
[18:36:20] <rmustacc> This may be why they added the SDC class.
[18:36:20] <sensille> but i see that you are also a bit surprised :)
[18:37:01] <rmustacc> I wouldn't expect it, but I'm also not surprised that things can end up that way.
[18:37:44] <sensille> you mentioned in #8493 you also had weird latencies on some boxes. that might well boil down to the same issue
[18:38:12] <sensille> the solution was to fix the worst offender
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[22:59:12] <gitomat> [illumos-gate] 11490 SRS ring polling disabled for VLANs -- Ryan Zezeski <ryan at zinascii dot com>
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[23:54:38] <sjorge> Nice! This made it upstream
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   March 3, 2020  
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