svn commit: r343030 - in head/sys: cam conf dev/md dev/nvme fs/fuse fs/nfsclient fs/smbfs kern sys ufs/ffs vm

Enji Cooper yaneurabeya at
Fri Feb 15 01:12:25 UTC 2019

> On Feb 14, 2019, at 15:34, Gleb Smirnoff <glebius at> 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 I've
> J> 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, and
> J> 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 can't
> J> provide much extra insight, but can readily reproduce the issues I see
> J> triggered by this change, so am willing to help where 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?

    Quick question: why was the value reduced by a factor of 4 on 64-bit platforms?
Thanks so much!

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