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[01:37:17] <danmcd> STREAMS, the gift that keeps on giving.
[01:37:35] <jbk> heh
[01:39:26] <_mjg> LeftWing: what are you testing htis with?
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[01:41:21] <_mjg> LeftWing: my bad, i see the issue
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[01:49:09] <LeftWing> _mjg: I wrote a small pipe load gen tool ... https://gist.github.com/jclulow/bc7d8a4ab5d466f3f51de60558246bbe
[01:49:53] <LeftWing> I need to go back and make QUANTUM dynamic; I was recompiling for each different write(2) size
[01:50:13] <LeftWing> Also I put it in the realtime scheduling class to reduce noise
[01:50:21] <jbk> it's not enough to just measure it? :)
[01:50:45] <LeftWing> Measure the noise?
[01:51:32] <jbk> waveform collapse and all that..
[01:51:43] <LeftWing> It was easier to just not have the noise :P
[01:51:47] <jbk> bad joke ;)
[01:51:48] <_mjg> hrm
[01:52:09] <_mjg> so did the kernel keep 2 threads on one cpu thread?
[01:52:19] <_mjg> or if they were migrating, did they stick to one socket?
[02:00:43] <LeftWing> _mjg: I haven't looked yet, but I expect RT to have greatly reduced potential migrations. Both threads were running concurrently
[02:01:12] <LeftWing> I need to profile where the SYS time goes too, especially for the 128K write case
[02:01:40] <LeftWing> I think it'd be neat to render a statemap for the threads too
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[02:03:59] <LeftWing> It was in a VM without NUMA information, too, so it's hard to know what the memory bandwidth situation is. I'll look at doing a test on some hardware before finishing
[02:05:32] <_mjg> afair illumos likes to rdsctp a lot, which definitely limits performance under virtualisation
[02:07:33] <_mjg> quick test gives me http://dpaste.com/09KBFKC
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[02:18:35] <_mjg> i think this locking in main() is avoidable and it may cause anomalies if you get unlucky
[02:19:19] <_mjg> instead of writing to it i would just remember last seen state
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[02:28:58] <_mjg> LeftWing: i can't use your program as it is, but a simple test with 'pv < /dev/zero | cat > /dev/null' gives me 2.25GB/s on bare metal when i make sure threads are on the same socket
[02:29:09] <_mjg> LeftWing: and 926MB/s if i make sure they are not
[02:29:14] <_mjg> LeftWing: on freebsd
[02:30:31] <LeftWing> _mjg: Yeah I think we have a number of low hanging fruit sort of issues we could knock down to make performance much better
[02:31:28] <LeftWing> I gather the FreeBSD pipe buffer size is 64KB by default?
[02:31:31] <_mjg> i believe rdsctp in the syscall entry/exit path is microstate accounting, which i strongly suspect can get away with much less accurate stamps
[02:31:42] <_mjg> it is 16 but the kernel will autoscale it up to 64
[02:32:08] <_mjg> will have to check what sizes are used by linux nowadays, will probalby have to bump them to match
[02:32:13] <LeftWing> Right, so 64 is the upper bound for a high throughput pipe
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[02:32:40] <LeftWing> I think I checked Linux too and it was 64KB by default, but with an ioctl to go much higher
[02:32:55] <_mjg> that's quite linuxy
[02:33:04] <LeftWing> Which is probably what we'll end up with: a default, a cap (maybe as an rctl) and the fcntl() thing
[02:34:08] <_mjg> i was considering adding a cache for pipe buffers (right now each time you alloc/free there is a tlb shootdown dance) and if memory serves vast majority of consumers were fine with 16KB
[02:34:23] <_mjg> that's measured while running full package build
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[02:35:59] <_mjg> as for microstate accounting, perhaps it can just /count/ transitions?
[02:36:09] <_mjg> should be drastically cheaper
[02:36:21] <_mjg> but i don't know if that owuld defeat the point
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[02:49:11] <_mjg> LeftWing: looks like cat itself is a bottleneck with always issuing 4KB reads. pv piped to pv and bount to the same cpu thread gives 7GB/s
[02:49:27] <_mjg> s/bount/bound/
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[03:35:53] <jbk> _mjg: how are you explicitly calling /bin/cat ?
[03:36:30] <jbk> it's annoyingly easy to get the ksh93 cat which has 'issues'
[03:38:59] <jbk> ISTR cat will either mmap or use stdio, which I thought stdio defaults to a 1k buffer
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[05:22:05] <_mjg> jbk: it's freebsd
[05:45:44] <jbk> ahh ok
[05:53:48] <AmyMalik> UUOC?
[05:53:58] <AmyMalik> i must admit I have uuoc'd before
[05:55:43] <jbk> UUOC?
[05:56:00] <jbk> UUCP?
[05:58:18] <AmyMalik> UUOC = useless use of cat
[05:58:33] <AmyMalik> and by the way, I have played with unix to unix copy before.
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[11:15:43] <_mjg> AmyMalik: it most definitely was not, something needed to be on the other end of the pipe
[11:16:54] <AmyMalik> _mjg: i mean like cat /usr/man/man1/fuckmaster.1 | less
[11:17:03] <AmyMalik> to read a man page for fuckmaster(1) raw
[11:17:38] <andyf> AmyMalik, would you please mind your language? My kids read this channel.
[11:17:53] * AmyMalik blinks.
[11:18:16] <AmyMalik> it's not like I'm telling anyone to go screw themself.
[11:21:09] <_mjg> i know, that's the standard. did not happen here though.
[11:21:19] <_mjg> cousin of ls * | grep
[11:21:28] <AmyMalik> i usually do find|grep
[11:21:31] <_mjg> for directories
[11:21:37] <AmyMalik> and find|xargs grep
[11:21:38] <_mjg> (instead of ls -d)
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[13:42:38] <leoric> ouch
[13:45:20] <leoric> builtin ksh mkdir doesn't honor mkdir -m higher bits
[13:45:43] <leoric> so mkdir -m 1777 /tmp/111 behaves like mkdir -m 777 /tmp/111
[13:47:26] <leoric> do we have an issue 'never use ksh builtins? ;)'
[13:56:42] <leoric> https://www.illumos.org/issues/11750
[14:08:26] <yuripv> it's time for one, too many issues
[14:09:22] <tsoome> more patches incoming:)
[14:09:57] <yuripv> related to ksh93? or just patches?
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[14:14:49] <jimklimov> well, not "never", just for the weird stuff :)
[14:15:39] <jimklimov> I wonder if it would be a least-surprise to amend `ksh` builtin to report (stderr) that it ignores the high bits... or to support them... maybe it intends to but has a bug prohibiting that?
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[16:36:42] <MarcelT> tsoome: could you please look once more at https://www.illumos.org/rb/r/2349/ ? I did some changes there... Thanks.
[16:39:51] <wilbury> syntatically ok ;-)
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[17:05:18] <tsoome> MarcelT: did swap other broadcast too?
[17:07:54] <MarcelT> tsoome: what other broadcasts? (and thanks for the review)
[17:08:54] <tsoome> both ot them:)
[17:10:41] <MarcelT> hm, I'm not sure I understand your question then
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[17:20:11] <tsoome> I was attempting to make a joke:)
[17:20:55] <MarcelT> then I missed it :-(
[17:21:07] <tsoome> naa.)
[17:21:10] <MarcelT> but I do not need to understand everything :-)
[17:21:28] <tsoome> it happens when you listen exadata trainings whole day...
[17:21:52] <MarcelT> I never did that, so I cannot confirm :-)
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[19:41:03] <jlevon> am I totally imagining /dev/cpu/self/msr ??
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[19:45:12] <tsoome> i see /dev/cpu/self/cpuid
[19:45:29] <jlevon> yes
[19:45:45] <jlevon> I could have sworn we had rdmsr support there too
[19:46:02] <jlevon> maybe that was ClosedSolaris but I thought it was ages ago
[19:46:25] <tsoome> let me see...
[19:49:50] <tsoome> hrm, ls in /dev is stalled
[19:50:59] <jlevon> so the question is, new file/driver, or new ioctl in cpuid?
[19:51:09] <jlevon> we already have one shoved into that driver for hwcap
[19:56:23] <alanc> I don't see /dev/cpu/self/msr on Solaris Trunk either, just cpuid
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[19:58:24] <tsoome> for some reason my solaris instance (latest support repo) is stuck on ls /dev - openat() is stalled
[20:06:38] <jlevon> oh dear
[20:06:45] <jlevon> alanc: thanks. weird.
[20:07:08] <jlevon> tsoome: someone needs to fix a devnames hang. mua ha ha ha
[20:08:13] <tsoome> solaris is feature complete we were told…
[20:08:25] <jlevon> it's not solarish if it doesn't have devname hangs
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[20:46:02] <jbk> heh
[20:46:49] <jbk> at least it's not us this time :)
[20:51:28] <tsoome> :D
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[20:52:51] <rmustacc> jlevon: Well, presumably if you want a rdmsr you want it on a per-cpu basis, no?
[20:54:49] <jlevon> self is sufficient for that though with pbind. seems a lot easier than doing all the file creation stuff
[20:55:03] <jlevon> it's really just for a private 'rdmsr' cmd
[20:56:15] <rmustacc> Fair enough. File creation is pretty easy, but *shrug*
[20:56:42] <rmustacc> It'll be easier than using kmdb, that's for sure.
[20:57:14] <jlevon> yeah. could always take a look at /dev/cpu/X later.
[20:58:21] <jlevon> by file creation I really meant the driver enumeration side, hopefully devfsadm would be relatively simple. still not a big deal, probably, but.
[21:00:55] <rmustacc> I did all of this recently in the temperature sensor drivers, so it was fairly easy, fwiw.
[21:05:13] <jlevon> hah, you're asking me not to be so lazy :) I'll take a look.
[21:06:09] <rmustacc> No, it's fine.
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[23:15:54] * despair86 reads scrollback
[23:16:04] <despair86> ohay its xorg guy
[23:16:19] <despair86> *xsun
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[23:41:14] <alanc> ex-Xsun, now Xorg
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   September 26, 2019  
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