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Date:      Mon, 28 May 2018 09:02:01 +0200
From:      Alexander Leidinger <Alexander@leidinger.net>
To:        Slawa Olhovchenkov <slw@zxy.spb.ru>
Cc:        Kirill Ponomarev <kp@krion.cc>, freebsd-current@freebsd.org
Subject:   Re: Deadlocks / hangs in ZFS
Message-ID:  <20180528090201.Horde._E4JZcuEaZHfj_BNzWjci2O@webmail.leidinger.net>
In-Reply-To: <20180527220612.GK1926@zxy.spb.ru>
References:  <20180522101749.Horde.Wxz9gSxx1xArxkYMQqTL0iZ@webmail.leidinger.net> <fa263af4-9bf7-88f8-8d23-21456daf7960@FreeBSD.org> <20180522122924.GC1954@zxy.spb.ru> <20180522161632.Horde.ROSnBoZixBoE9ZBGp5VBQgZ@webmail.leidinger.net> <20180522144055.GD1954@zxy.spb.ru> <20180527194159.v54ox3vlthpuvx4q@jo> <20180527220612.GK1926@zxy.spb.ru>

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Quoting Slawa Olhovchenkov <slw@zxy.spb.ru> (from Mon, 28 May 2018=20=20
01:06:12=20+0300):

> On Sun, May 27, 2018 at 09:41:59PM +0200, Kirill Ponomarev wrote:
>
>> On 05/22, Slawa Olhovchenkov wrote:
>> > > It has been a while since I tried Karl's patch the last time, and I
>> > > stopped because it didn't apply to -current anymore at some point.
>> > > Will what is provided right now in the patch work on -current?
>> >
>> > I am mean yes, after s/vm_cnt.v_free_count/vm_free_count()/g
>> > I am don't know how to have two distinct patch (for stable and=20=20
>>=20current) in one review.
>>
>> I'm experiencing these issues sporadically as well, would you mind
>> to publish this patch for fresh current?
>
> Week ago I am adopt and publish patch to fresh current and stable, is
> adopt need again?

I applied the patch in the review yesterday to rev 333966, it applied=20=20
OK=20(with some fuzz). I will try to reproduce my issue with the patch.

Some thoughts I had after looking a little bit at the output of top...=20=
=20
half=20of the RAM of my machine is in use, the other half is listed as=20=
=20
free.=20Swap gets used while there is plenty of free RAM. I have NUMA in=20=
=20
my=20kernel (it's 2 socket Xeon system). I don't see any NUMA specific=20=
=20
code=20in the diff (and I don't expect something there), but could it be=20=
=20
that=20some NUMA related behavior comes into play here too? Does it make=20=
=20
sense=20to try without NUMA in the kernel?

Bye,
Alexander.
--=20
http://www.Leidinger.net=20Alexander@Leidinger.net: PGP 0x8F31830F9F2772BF
http://www.FreeBSD.org    netchild@FreeBSD.org  : PGP 0x8F31830F9F2772BF

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