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
