From mboxrd@z Thu Jan 1 00:00:00 1970 From: michi1@michaelblizek.twilightparadox.com (michi1 at michaelblizek.twilightparadox.com) Date: Thu, 3 May 2012 15:54:44 +0200 Subject: Kernel latency for handling the Network traffic In-Reply-To: <333797351DE86B4BA5EE7CC1C71C79A94796167AEE@CLUSTEREDMB.intranet.com> References: <333797351DE86B4BA5EE7CC1C71C79A94796167AEE@CLUSTEREDMB.intranet.com> Message-ID: <20120503135444.GA10940@grml> To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org Hi! On 16:33 Thu 03 May , Suresh Kumar Subramanian wrote: > Hi, > > I am building the router based on linux kernel. > > The hardware details are below, > 2 - 64 bit quad core processor (3Ghz core). > RAM- 24GB RAM. > PCI express slot- connected with Quad Port 100Mbps Ethernet adapter -2. (so total 8 ethernet interfaces) > > > I just want to calculate the maximum traffic the router can handle..?. > > The maximum traffic could be, also 8 ports(100Mbps) * 2 directions = 1600Mbps. > > Can this system(kernel + hardware) handle this much traffic. (Assume the best case)? Yes, it can. I have seen a benchmark which basically said that a single quad core cpu with ~3GHz was enough for about 4 links with 10 *gigabit* each. That said, VPNs can slow down processing dramatically, iptables less so. If you want to saturate links with 10 gigabit, you need to use a special qdisc, which might prevent you to do QoS. > I think, There is calculation to identify the packet processing time in linux kernel (kernel & hw cpu freq). I am not aware of this. What do you mean? -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.twilightparadox.com