Date: Tue, 22 May 2018 17:40:55 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Alexander Leidinger <Alexander@leidinger.net> Cc: freebsd-current@freebsd.org Subject: Re: Deadlocks / hangs in ZFS Message-ID: <20180522144055.GD1954@zxy.spb.ru> In-Reply-To: <20180522161632.Horde.ROSnBoZixBoE9ZBGp5VBQgZ@webmail.leidinger.net> 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>
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On Tue, May 22, 2018 at 04:16:32PM +0200, Alexander Leidinger wrote:
>
> Quoting Slawa Olhovchenkov <slw@zxy.spb.ru> (from Tue, 22 May 2018
> 15:29:24 +0300):
>
> > On Tue, May 22, 2018 at 08:17:00AM -0400, Steve Wills wrote:
> >
> >> I may be seeing similar issues. Have you tried leaving top -SHa running
> >> and seeing what threads are using CPU when it hangs? I did and saw pid
> >> 17 [zfskern{txg_thread_enter}] using lots of CPU but no disk activity
> >> happening. Do you see similar?
>
> I will try and report back.
>
> > Can you try https://reviews.freebsd.org/D7538 and report?
>
> The patch tells it is against -STABLE, we're talking -current here.
ZFS don't changes this.
> 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 current) in one review.
> As a data point, the system I talk about in the start of the thread
> has 64 GB RAM and the ARC is not limited via sysctl.
Currently vanlia ARC poorly limited via sysctl. After abd extra.
May be interesting test
./sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c:boolean_t zfs_abd_scatter_enabled = B_FALSE;
(no sysctl for change this exist)
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