Date: Sun, 29 May 2022 10:07:29 -0700 From: Pete Wright <pete@nomadlogic.org> To: Mark Millard <marklmi@yahoo.com>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: Chasing OOM Issues - good sysctl metrics to use? Message-ID: <b6017cc8-3734-da81-8c73-5715f2e3ff94@nomadlogic.org> In-Reply-To: <8C14A90D-3429-437C-A815-E811B7BFBF05@yahoo.com> References: <8C14A90D-3429-437C-A815-E811B7BFBF05.ref@yahoo.com> <8C14A90D-3429-437C-A815-E811B7BFBF05@yahoo.com>
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On 5/14/22 01:09, Mark Millard wrote:
>
> One of the points is to see if I get any evidence of
> vm.swap_enabled=0 with vm.swap_idle_enabled=0 ending up
> contributing to any problems in my normal usage. So far: no.
> vm.pageout_oom_seq=120 is in use for this, my normal
> context since sometime in 2018.
So to revive an old thread here.
it looks like setting these two sysctl knobs have helped the situation:
vm.swap_enabled=0
vm.swap_idle_enabled=0
i've gone 7 days without any OOM events under normal work usage (as
opposed to about 4days previously). this includes the following patch
to vm_pageout.c that tijl@ shared with us:
diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
index 36d5f327580..df827af3075 100644
--- a/sys/vm/vm_pageout.c
+++ b/sys/vm/vm_pageout.c
@@ -1069,7 +1069,7 @@ vm_pageout_laundry_worker(void *arg)
nclean = vmd->vmd_free_count +
vmd->vmd_pagequeues[PQ_INACTIVE].pq_cnt;
ndirty = vmd->vmd_pagequeues[PQ_LAUNDRY].pq_cnt;
- if (target == 0 && ndirty * isqrt(howmany(nfreed + 1,
+ if (target == 0 && ndirty * isqrt(howmany(nfreed,
vmd->vmd_free_target - vmd->vmd_free_min)) >= nclean) {
target = vmd->vmd_background_launder_target;
}
I have adjusted my behavior a little bit as well, since i do quite a bit
of work in the AWS console in firefox I've been better at closing out
all of those tabs when i'm not using them (their console is a serious
memory hog). i've also started using an official chrome binary inside
an ubuntu jail which is where i run slack and discord, that seems to
behave better as well in terms of memory utilization.
i am going to revert the vm_pageout.c patch today when i do my weekly
rebuild of world to see how things go, maybe that'll give determine if
its really the sysctl's helping or not.
cheers,
-pete
--
Pete Wright
pete@nomadlogic.org
@nomadlogicLA
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