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Date:      Mon, 6 Jan 2020 10:32:13 +0100 (CET)
From:      Wojciech Puchar <wojtek@puchar.net>
To:        Mark Millard <marklmi@yahoo.com>
Cc:        Wojciech Puchar <wojtek@puchar.net>, freebsd-hackers@freebsd.org
Subject:   Re: processes are killed because of out of swap space
Message-ID:  <alpine.BSF.2.20.2001061030350.27958@puchar.net>
In-Reply-To: <B30C7C68-CFB7-4252-B114-BEC023501FC9@yahoo.com>
References:  <C1C8F724-88B0-49D9-A9DF-DB0AA8AF3164.ref@yahoo.com> <C1C8F724-88B0-49D9-A9DF-DB0AA8AF3164@yahoo.com> <alpine.BSF.2.20.2001051307080.18098@puchar.net> <alpine.BSF.2.20.2001051408100.3906@puchar.net> <9C6B115C-90CC-449D-A29D-429BD97F37C4@yahoo.com> <alpine.BSF.2.20.2001052139580.34061@puchar.net> <B30C7C68-CFB7-4252-B114-BEC023501FC9@yahoo.com>

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> context.
>
> If anyone is to work on geom_raid5, knowledge that:
>
> A) it was getting OOM kills that the other technique did not
> and:
> B) vm.pageout_oom_seq changes were controlling when
>
> likely would be useful background information. I
> wonder if a bugzilla report of such would be
> appropriate. (Some detail about the time frames
> for the alternative vm.pageout_oom_seq figures might
> be appropriate.)
>
> ===
geom_raid5 seems to be more buggy.

I was aware that it write buffers data so in case of power loss there 
would be damage, but i've set 3 second maximum caching time and got huge
destruction of underlaying filesystem (fsck displayed hundreds of 
thousands of errors).





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