Date: Mon, 8 May 2006 08:35:11 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Kris Kennaway <kris@obsecurity.org> Cc: performance@FreeBSD.org, current@FreeBSD.org Subject: Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets) Message-ID: <20060508083359.I17611@fledge.watson.org> In-Reply-To: <20060508065207.GA20386@xor.obsecurity.org> References: <20060506150622.C17611@fledge.watson.org> <20060506221908.GB51268@xor.obsecurity.org> <20060507210426.GA4422@xor.obsecurity.org> <20060507214153.GA5275@xor.obsecurity.org> <20060507230430.GA6872@xor.obsecurity.org> <20060508065207.GA20386@xor.obsecurity.org>
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On Mon, 8 May 2006, Kris Kennaway wrote:
> unp contention has risen a bit. The other big gain is to sleep mtxpool
> contention, which roughly doubled:
In the general case, you can increase the size of the mutex pool. However,
since this is per-uid for the socket buffer resource limits, that won't help
you as the same user will always contend with itself. We'll need to think
about this some -- good activity for the plane today :-).
Nice work so far, btw. Sounds like we're making real headway!
Robert N M Watson
>
> /*
> * Change the total socket buffer size a user has used.
> */
> int
> chgsbsize(uip, hiwat, to, max)
> struct uidinfo *uip;
> u_int *hiwat;
> u_int to;
> rlim_t max;
> {
> rlim_t new;
>
> UIDINFO_LOCK(uip);
>
> So the next question is how can that be optimized?
>
> Kris
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