Re: "Oddness" in head since around r343678 or so

From: Alexander Leidinger <Alexander_at_Leidinger.net>
Date: Fri, 08 Feb 2019 10:27:59 +0100
Hi,

I recently noticed some generic slowness myself. I experienced this during 
replacing disks in a raidz by bigger ones. Long story short, check top -s 
if you have vnlru running for a long period at high CPU... If yes increase 
kern.maxvnodes (I increased to 10 times). Note, we should improve the admin 
page in the FAQ, the vnlru entry could need a little bit more hints and 
explanations.

If you encounter the same issue we have probably introduced a change 
somewhere with an unintended side effect.

Bye,
Alexander.

-- 
Send from a mobile device, please forgive brevity and misspellings.

Am 7. Februar 2019 4:43:43 nachm. schrieb "Rodney W. Grimes" 
<freebsd-rwg_at_pdx.rh.CN85.dnsmgr.net>:

>> I run and track stable/11, stable/12, and head (from separate slices --
>> no VMs involved) on my laptop; among other things, this permits some
>> degree of comparison among them.
>>
>> The laptop is configured to run xdm; while running stable/11 or
>> stable/12, there's a period of about 5 seconds after xdm's login banner
>> shows up before either the mouse or keyboard responds.
>>
>> Up to a few days ago, head was the same, but as of about last weekend (I
>> think), that period is about 40 seconds while running head.
>>
>> I realize that's a little ... lacking in specificity, and I apologize
>> for that.  And while I noticed it a few days ago, I hadn't actually
>> timed it until this morning.
>
> My addition is going to lack even worse, I have been seeing very
> long periods of lag, on this 40 second order, when a bhyve instance
> is started.  The interactive response for this time is 0, not
> even ^t produces any output.  The prompt comes back almost immediatly
> after typing the bhyve command, but that prompt is dead for a
> very long time.
>
> I am running 12.0-RELEASE, and see this issue on multiple machines.
>
>>
>> Information, including verbose dmesg.boot copies and a log of uname
>> outputs, may be found from the page at
>> <http://www.catwhisker.org/~david/FreeBSD/history/>.
>>
>> Here's a list of the uname outputs for head over the last several days:
>>
>> FreeBSD 13.0-CURRENT #245 r343551M/343551: Tue Jan 29 03:54:46 PST 2019     
>> root_at_g1-49.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  
>> amd64 1300010
>> FreeBSD 13.0-CURRENT #246 r343572M/343572: Wed Jan 30 05:14:44 PST 2019     
>> root_at_g1-49.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  
>> amd64 1300010
>> FreeBSD 13.0-CURRENT #247 r343604M/343604: Thu Jan 31 03:53:37 PST 2019     
>> root_at_g1-49.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  
>> amd64 1300010
>> FreeBSD 13.0-CURRENT #248 r343646M/343658: Fri Feb  1 04:05:45 PST 2019     
>> root_at_g1-49.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  
>> amd64 1300010
>> FreeBSD 13.0-CURRENT #249 r343678M/343678: Sat Feb  2 03:55:23 PST 2019     
>> root_at_g1-49.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  
>> amd64 1300010
>> FreeBSD 13.0-CURRENT #250 r343707M/343711: Sun Feb  3 04:06:08 PST 2019     
>> root_at_g1-49.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  
>> amd64 1300010
>> FreeBSD 13.0-CURRENT #251 r343732M/343741: Mon Feb  4 04:24:07 PST 2019     
>> root_at_g1-49.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  
>> amd64 1300010
>> FreeBSD 13.0-CURRENT #252 r343770M/343771: Tue Feb  5 04:27:38 PST 2019     
>> root_at_g1-49.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  
>> amd64 1300010
>> FreeBSD 13.0-CURRENT #253 r343828M/343834: Wed Feb  6 03:59:36 PST 2019     
>> root_at_g1-49.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  
>> amd64 1300010
>> FreeBSD 13.0-CURRENT #254 r343867M/343867: Thu Feb  7 04:52:38 PST 2019     
>> root_at_g1-49.catwhisker.org:/common/S4/obj/usr/src/amd64.amd64/sys/CANARY  
>> amd64 1300010
>>
>> Peace,
>> david
>> --
>> David H. Wolfskill				david_at_catwhisker.org
>> "It was like reading a Donald Trump tweet.  It didn't make any sense."
>>
>> See http://www.catwhisker.org/~david/publickey.gpg for my public key.
>
> --
> Rod Grimes                                                 rgrimes_at_freebsd.org
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Received on Fri Feb 08 2019 - 08:28:32 UTC

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