I'm using those settings at kernel level (exerpt from grub config) : kernel /boot/vmlinuz-2.6.14 root=/dev/sda1 ro maxbatch=300 rhash_entries=1048575 maxbatch is used to prevent Quagga killing the machine by sending a massive route update. rhash_entries gives more room to handle a full internet routing table. Queuing should be done at the ethernet card level. Use 'ethtool' to tune the settings of your card. For instance, when compiling a kernel for Intel Pro1000-MT cards, use the following settings (kernel .config file) : CONFIG_E1000=m CONFIG_E1000_NAPI=y Then tune the settings by using : /usr/sbin/ethtool -G eth0 rx 4096 tx 4096 With NAPI, the network card does not trigger an interrupt each time a packet is sent or received. That's up to the kernel to poll the network interface. Hope this helps, (and for the other readers, correct me if I'm wrong ;-) ) -- |--- Jean-Francois "Jef" Stenuit On Thu, 27 Apr 2006, Serge Goodenko wrote: > Hi everybody! > > I got the following question. > > When I use linux as a router (via ip forwarding) what kernel variables > (maybe some queues?) represent the closest analogue of usual hardware router > input and output buffers? May this be, say, backlog queue or something else? > > The things I need to get are the sizes and loads of that buffers during > transmission. > I know about variables such as sk->sk_rcvbuf and sk->sk_rmem_alloc but they > are not used during ip forwarding as the socket (i.e. sock structure) is not > even being created for that purpose. As far as I understood these variables > in sock structure are mostly used for tcp-level packet processing and they > represent the values written in files like /proc/sys/net/core/wmem_default > etc. (please correct me if that's wrong), but nevertheless maybe I also can > use these values for "routing" buffers (i.e. on ip level)? > > thanks in advance, > Serge > MIPT > Moscow, Russia > - > : send the line "unsubscribe linux-net" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
