Date: Tue, 17 Jul 2007 17:22:17 -0700 From: "David Christensen" <davidch@broadcom.com> To: "Chuck Swiger" <cswiger@mac.com> Cc: current@freebsd.org Subject: RE: Getting/Forcing Greater than 4KB Buffer Allocations Message-ID: <09BFF2FA5EAB4A45B6655E151BBDD9030483F17F@NT-IRVA-0750.brcm.ad.broadcom.com> In-Reply-To: <2E0C9A04-678B-4C44-9D2E-5500F2C08FE7@mac.com> References: <09BFF2FA5EAB4A45B6655E151BBDD9030483F161@NT-IRVA-0750.brcm.ad.broadcom.com> <2E0C9A04-678B-4C44-9D2E-5500F2C08FE7@mac.com>
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> > I'm investigating a problem with my bce driver which occurs=20 > when I ask > > for a jumbo mbuf cluster (through m_cljget()). When I map the =20 > > memory for DMA I > > normally get 3 memory segments (4KB + 4KB + 1KB) on my system, but =20 > > 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 =20 > > involved? The > > system is a Xeon dual-core processor and has 8GB of RAM,=20 > running an =20 > > AMD64 version of > > the kernel. >=20 > Hi, Dave-- >=20 > Is "sysctl hw.pagesize" different on the two systems? It sure looks =20 > like the first machine is using a 4KB pagesize, whereas the second =20 > machine is using an 8KB pagesize... >=20 That was one of my first questions but they are identical, 4096 bytes. Dave
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