Date: Mon, 4 Nov 2013 16:23:34 +0000 From: Tom Evans <tevans.uk@googlemail.com> To: David Wolfskill <david@catwhisker.org> Cc: freebsd-performance@freebsd.org Subject: Re: Reality check? compat.ia32.maxdsiz in jailed "32-bit" environment Message-ID: <CAFHbX1%2BTSrPJBkaHTdi7QbB-vKQqwU3W_cYwD2PCuc%2BOrN-%2B3g@mail.gmail.com> In-Reply-To: <20131104154908.GD1711@albert.catwhisker.org> References: <20131104154908.GD1711@albert.catwhisker.org>
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On Mon, Nov 4, 2013 at 3:49 PM, David Wolfskill <david@catwhisker.org> wrot= e: > I am supporting a performance-sensitive software development > environment that: > =E2=80=A6 > I have (also) started experimenting with increasing compat.ia32.maxdsiz > beyond its default of 512MB: Initially, I kicked it to 2GB; more > recently, I tried setting it to 3GB. > > While I have not noticed any negative issues from either of the above > non-default settings, I have done but limited testing with concurrent > software builds in my test environment. IIRC, when running on pure i386, setting kern.maxdsiz limits the amount of kernel address space (or rather, dsize+KVA =3D 4 GB), and so you had to be careful when increasing kern.maxdsiz. This probably has no effect on a i386 on amd64 jail though. Cheers Tom
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