Date: Wed, 21 Dec 2011 13:25:06 -0800 From: "David Christensen" <davidch@broadcom.com> To: "Sean Bruno" <seanbru@yahoo-inc.com>, "John Baldwin" <jhb@freebsd.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: RE: stable/7 bce(4) out of buffers Message-ID: <5D267A3F22FD854F8F48B3D2B52381938616740FEB@IRVEXCHCCR01.corp.ad.broadcom.com> In-Reply-To: <1323971445.3551.1.camel@hitfishpass-lx.corp.yahoo.com> References: <1323802814.26931.16.camel@hitfishpass-lx.corp.yahoo.com> <201112151000.52116.jhb@freebsd.org> <1323971445.3551.1.camel@hitfishpass-lx.corp.yahoo.com>
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> > > dev.bce.0.com_no_buffers: 130228 > > > > Hmm, in HEAD there looks to be a hw.bce.rx_pages that can be set to > > 1, 2, 4, or 8. It defaults to 2. In the 7 driver it looks like this > > is a #define in sys/dev/bce/if_bcereg.h (RX_PAGES on line 6710). Try > > changing RX_PAGES from 2 to 4 (or 8) and recompiling your kernel (or > > bce driver) and see if that helps. > > > > Indeed, I was eyeballing that just now. I'll post back with results. > Adding buffers might help but more often than not you really should adjust the interrupt coalescing sysctls (hw.bce.rx_quick_cons_trip, hw.bce.rx_ticks) so the hardware releases frames to the OS more frequently and fetches new buffers. Setting both values closer to 1 improves latency and small packet performance but does increase CPU load due to the increased number of interrupts. Davehelp
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