Date: Wed, 19 Mar 2014 13:51:04 +0100 From: Adrian Gschwend <ml-ktk@netlabs.org> To: freebsd-fs@freebsd.org Subject: Re: kern/187594: [zfs] [patch] ZFS ARC behavior problem and fix Message-ID: <532992B8.4090407@netlabs.org> In-Reply-To: <53288629.60309@FreeBSD.org> References: <201403181520.s2IFK1M3069036@freefall.freebsd.org> <53288024.2060005@denninger.net> <53288629.60309@FreeBSD.org>
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On 18.03.14 18:45, Andriy Gapon wrote: >> This is consistent with what I and others have observed on both 9.2 >> and 10.0; the ARC will expand until it hits the maximum configured >> even at the expense of forcing pages onto the swap. In this >> specific machine's case left to defaults it will grab nearly all >> physical memory (over 20GB of 24) and wire it down. > Well, this does not match my experience from before 10.x times. I reported the issue on which Karl gave feedback and developed the patch. The original thread of my report started here: http://lists.freebsd.org/pipermail/freebsd-fs/2014-March/019043.html Note that I don't have big memory eaters like VMs, it's just a bunch of jails and services running in them. Including some JVMs. Check out the munin graphs before and after: Daily which does not seem to grow much anymore now: http://ktk.netlabs.org/misc/munin-mem-zfs1.png Weekly: http://ktk.netlabs.org/misc/munin-mem-zfs2.png You can actually see where I activated the patch (16.3), the system behaves *much* better since then. I did one more reboot that's why it goes down again but since then I did not reboot anymore. The moments where munin did not report anything the system was in the ARC-swap lock and virtually dead. From working on the system it feels like a new machine, everything is super fast and snappy. I don't understand much of the discussions you guys are having but I'm pretty sure Karl fixed an issue which gave me headache on BSD over years. I first saw this in 8.x when I started to use ZFS productively and I've seen it in all 9.x release as well up to this patch. regards Adrian
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