Date: Thu, 25 Oct 2012 17:27:41 +0000 From: "David Christensen" <davidch@broadcom.com> To: "Eugene Mitrofanov" <eugene@imedia.ru>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: RE: dev.bce.3.mbuf_alloc_failed_count increases permanently Message-ID: <3A5015FE9E557D448AF7238AF0ACE20A24B0F4@IRVEXCHMB11.corp.ad.broadcom.com> In-Reply-To: <201210121812.37557.eugene@imedia.ru>
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> sysctl -a | g bce.3|g -vE '(%|stat)'; echo; sleep 10; sysctl -a | g bce.3| > g -vE '(%|stat)'; echo; netstat -m > > dev.bce.3.l2fhdr_error_count: 0 > dev.bce.3.mbuf_alloc_failed_count: 2098854 > dev.bce.3.mbuf_frag_count: 2655285 > dev.bce.3.dma_map_addr_rx_failed_count: 0 > dev.bce.3.dma_map_addr_tx_failed_count: 57 > dev.bce.3.unexpected_attention_count: 0 > dev.bce.3.com_no_buffers: 0 > > dev.bce.3.l2fhdr_error_count: 0 > dev.bce.3.mbuf_alloc_failed_count: 2098856 > dev.bce.3.mbuf_frag_count: 2655288 > dev.bce.3.dma_map_addr_rx_failed_count: 0 > dev.bce.3.dma_map_addr_tx_failed_count: 57 > dev.bce.3.unexpected_attention_count: 0 > dev.bce.3.com_no_buffers: 0 > > > Any suggestions? What is the reason of this? It's normal in a system under load, the kernel can't always allocate memory when requested by the driver. The result is that RX frames will be dropped as the driver reuses an existing mbuf, a response taken by many other drivers. If you notice rapid increases during certain system operations then you should consider increasing the amount of system memory. Davehome | help
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