Hi, No think its not related to MTU.. Because when i tried to test two machine that directly connect i achieve 980Mbit/sec.. The diagram like that: |Netperf(Client)|<----->|Netperf(Server| -> 960Mb/s In another test only i put Linux machine between them and change server subnet.. And i tried to use Linux as forwarder.. Performance degraded to 240Mbit/sec.. The diagram like that: |NP Client(s)|<-->|Linux GW|<-->|NP Server(s)| Today i switch another Linux machine that have two onboard Gigabit/Ethernet. And i achieve 650 Mbit/sec. So i realize that its related to Bus problem.. But i don't understand why it's degraded to much! As i know 32bit/33Mhz give me at least 1 Gb/sec. Is there somebody that explain this situation? Thanks.. devrim --- anil kumar <anildahiya80@xxxxxxxxx> wrote: > Hi > As far I understand, Its because of tcp packet mtu > size. Please check > packet mtu in both scenario. And repeat test with > udp protocol also > > Thanks, > Anil > > > On Feb 7, 2008 3:05 PM, Devrim SERAL > <dseral@xxxxxxxxx> wrote: > > Hi all, > > > > I am trying to test different OS networking > > capabilities for 4 days. > > > > I am using netperf for testing tool. I have > achived to > > 980Mbit/sec unidirectional speed between two > machines. > > > > > > However when i put Linux machine between this > > environment > > This speed degrade to approx 240Mbit/sec. > > > > My network diagram quite simple.. > > |NP Client(s)|<----->|Linux GW|<---->|NP > Server(s)| > > > > I tried to tune Linux GW but its not change > results.. > > (Increase tx,rx buffer, change tcp buffer > parameters > > etc..) > > > > After all i decide this problem may related to HW > > problem and i tried to change GW machine to > another > > platform..Additionally i take one Gigabit/eth from > old > > machine.. > > > > In second platform i have achieved to approx > > 600Mbit/sec.. > > > > So my question arise here.. > > > > My first machine use gigabyte GA-M61PM-S2 and two > > edimax Gigabit ethernet (EN-9230TX-32 Rtl 8169S). > > These two Ethernet use 33Mhz 32bit PCI bus.. > > > > And second one have one onboard and additionally > one > > Edimax GE (Same as first machine) and located > 66Mhz > > bus.. > > > > As i know 33Mhz PCI Bus with 32bit performance is= > > (33x10^6)*32=1056000000 --> 1Gb/sec if add > latency > > and another effects may performance equal > > 800Mbit/sec.. > > > > And also i have experiments with this system i > > installed netperf server and achive to > 980Gbit/sec. > > > > So why performance degraded to 240Mbit/sec when i > use > > two gigabit ethernet on same Bus? > > > > Is this Controller spesific, Linux driver spesific > or > > Ethernet spesific problem? > > > > Thanks for your answers.. > > Regards > > devrim > > > > > > > > > > > > > > > > > > > > > ____________________________________________________________________________________ > > Looking for last minute shopping deals? > > Find them fast with Yahoo! Search. > http://tools.search.yahoo.com/newsearch/category.php?category=shopping > > - > > To unsubscribe from this list: 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 > > > - > To unsubscribe from this list: 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 > ____________________________________________________________________________________ Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping - To unsubscribe from this list: 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
