Date: Fri, 15 Feb 2019 12:08:54 -0600 From: Justin Hibbits <chmeeedalf@gmail.com> To: Gleb Smirnoff <glebius@freebsd.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r343030 - in head/sys: cam conf dev/md dev/nvme fs/fuse fs/nfsclient fs/smbfs kern sys ufs/ffs vm Message-ID: <20190215120854.15545f1d@ralga.knownspace> In-Reply-To: <20190214233410.GJ83215@FreeBSD.org> References: <201901150102.x0F12Hlt025856@repo.freebsd.org> <20190213192450.32343d6a@ralga.knownspace> <20190214233410.GJ83215@FreeBSD.org>
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On Thu, 14 Feb 2019 15:34:10 -0800
Gleb Smirnoff <glebius@freebsd.org> wrote:
> Hi Justin,
>
> On Wed, Feb 13, 2019 at 07:24:50PM -0600, Justin Hibbits wrote:
> J> This seems to break 32-bit platforms, or at least 32-bit book-e
> J> powerpc, which has a limited KVA space (~500MB). It preallocates
> J> I've seen over 2500 pbufs, at 128kB each, eating up over 300MB KVA,
> J> leaving very little left for the rest of runtime.
> J>
> J> I spent a couple hours earlier today debugging with Mark Johnston,
> J> and his consensus is that the vnode_pbuf_zone is too big on 32-bit
> J> platforms. Unfortunately I know very little about this area, so
> J> can't provide much extra insight, but can readily reproduce the
> J> issues I see triggered by this change, so am willing to help where
> J> I can.
>
> Ok, let's roll back to old default on 32-bit platforms and somewhat
> reduce the default on 64-bits.
>
> Can you please confirm that the patch attached works for you?
>
Hi Gleb,
Thanks for the patch. I've built and installed. My machine boots up
fine, and I dropped to ddb to check vmem. Results are as follows:
r343029:
kernel arena domain:
size: 67108864
inuse: 66482176
free: 62668
kernel arena:
size: 624951296
inuse: 579207168
free: 45744128
r344123 with your patch:
kernel arena domain:
size: 71303168
inuse: 68153344
free: 3149824
kernel arena:
645922816
inuse: 632369152
free: 13553664
I've kicked off a buildworld+buildkernel to see how it survives.
This machine has 8GB RAM and 4GB swap, if that has any impact.
- Justin
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