Date: Mon, 19 Aug 2013 10:40:10 -0700 From: Peter Grehan <grehan@freebsd.org> To: Andre Oppermann <andre@FreeBSD.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Navdeep Parhar <np@FreeBSD.org> Subject: Re: svn commit: r254520 - in head/sys: kern sys Message-ID: <5212587A.2080202@freebsd.org> In-Reply-To: <521256CE.6070706@FreeBSD.org> References: <201308191116.r7JBGsc6065793@svn.freebsd.org> <521256CE.6070706@FreeBSD.org>
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> I recently tried some experiments to reduce the number of mbuf and > cluster allocations in a 40G NIC driver. M_NOFREE and EXT_EXTREF proved > very useful and the code changes to the kernel were minimal. See > user/np/cxl_tuning. The experiment was quite successful and I was > planning to bring in most of those changes to HEAD. I was hoping to get > some runtime mileage on the approach in general before tweaking the > ctors/dtors for jumpbo, jumbo9, jumbo16 to allow for an mbuf+refcnt > within the cluster. But now M_NOFREE has vanished without a warning... I also had a virtualization work-in-progress where static mbufs were allocated in the kernel and M_NOFREE set. Might be worth sending a prior heads-up for these type of changes. later, Peter.
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