Date: Fri, 24 Sep 2004 07:27:18 +1200 From: Juha Saarinen <juhasaarinen@gmail.com> To: "David G. Lawrence" <dg@dglawrence.com> Cc: freebsd-current@freebsd.org Subject: Re: Could ARG_MAX be increased? Message-ID: <b34be8420409231227575cc793@mail.gmail.com> In-Reply-To: <20040923122620.GW16205@nexus.dglawrence.com> References: <b34be84204092304456066b0a0@mail.gmail.com> <20040923122620.GW16205@nexus.dglawrence.com>
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On Thu, 23 Sep 2004 05:26:20 -0700, David G. Lawrence <dg@dglawrence.com> wrote: > I feel compelled to respond since you mentioned me above and since I > wrote most of the code involved... :-) > The main issue with increasing the size of ARG_MAX is that it will result > in more kernel virtual memory being reserved for temporary storage of the > args. This used to be a much larger problem when KVM was scarce, but less > of a problem now with 1GB or more of KVM. The args temporary space is > allocated out of exec_map (a submap of kernel_map), which is sized to be > about 16 * ARG_MAX. The '16' is to allow up to 16 processes to simultaneously > exec until additional execs are blocked waiting for KVM to become > available. Anyway, increasing ARG_MAX to 256K (roughly 4MB of KVM) should > be okay on most systems. Very good and thorough response there :-) Is it worth putting in a PR on this? -- Juha
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