Date: Fri, 26 Oct 2012 17:56:38 +0000 From: "David Christensen" <davidch@broadcom.com> To: "Eugene Mitrofanov" <eugene@imedia.ru> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: RE: dev.bce.3.mbuf_alloc_failed_count increases permanently Message-ID: <3A5015FE9E557D448AF7238AF0ACE20A251BE0@IRVEXCHMB11.corp.ad.broadcom.com> In-Reply-To: <201210261227.15689.eugene@imedia.ru> References: <201210121812.37557.eugene@imedia.ru> <3A5015FE9E557D448AF7238AF0ACE20A24B0F4@IRVEXCHMB11.corp.ad.broadcom.com> <201210261227.15689.eugene@imedia.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
> > > 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. > > >=20 > Thanks for you answer, Dave. >=20 > What do you mean under "systems memory"? Is it the physical memory or the > virtual one? Virtual memory is likely sufficient in this case, though more frequent swap= ping may cause an equivalent performance loss to the dropped network traffic (i.= e. you may be swapping one performance bottleneck for another). The counter=20 "dma_map_addr_*" is incremented when the OS cannot map an MBUF for DMA=20 access. If you see that incrementing as rapidly then you should definitely= look at adding physical memory. Dave
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3A5015FE9E557D448AF7238AF0ACE20A251BE0>