Date: Tue, 17 Jul 2007 17:14:36 -0700 From: Chuck Swiger <cswiger@mac.com> To: David Christensen <davidch@broadcom.com> Cc: current@freebsd.org Subject: Re: Getting/Forcing Greater than 4KB Buffer Allocations Message-ID: <2E0C9A04-678B-4C44-9D2E-5500F2C08FE7@mac.com> In-Reply-To: <09BFF2FA5EAB4A45B6655E151BBDD9030483F161@NT-IRVA-0750.brcm.ad.broadcom.com> References: <09BFF2FA5EAB4A45B6655E151BBDD9030483F161@NT-IRVA-0750.brcm.ad.broadcom.com>
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On Jul 17, 2007, at 4:54 PM, David Christensen wrote: > I'm investigating a problem with my bce driver which occurs when I ask > for a jumbo mbuf cluster (through m_cljget()). When I map the > memory for DMA I > normally get 3 memory segments (4KB + 4KB + 1KB) on my system, but > on another > user's system he's seeing 2 memory segments (8KB + 1KB). Is there a > configurationoption that allows this or some other tuning variable > involved? The > system is a Xeon dual-core processor and has 8GB of RAM, running an > AMD64 version of > the kernel. Hi, Dave-- Is "sysctl hw.pagesize" different on the two systems? It sure looks like the first machine is using a 4KB pagesize, whereas the second machine is using an 8KB pagesize... -- -Chuck
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