Am 31.08.2011 14:09, schrieb Ben Hutchings: >> I think I found a performance issue in the kernel (2.6.32/amd64) of the >> squeeze release. >> >> I tested from different servers and each time made a wget of a 16 MB >> file from a remote co-location which is connected with gigabit (but the >> issue showed also on a 32MBit/s "dial-up" cable connection). >> >> The squeeze system starts the transfer significantly slower and takes >> longer to get faster over time (on a 2GB file the maximum was reached >> after 12 seconds). The lenny system reaches this maxium very fast so the >> overall time drops from 2.4s to 0.4s. It could be, this is related to >> changes in TCP/IP behaviour. I could not see this behaviour in the same >> subnet, it shows up, as soon as routing is involved in the connection. > [...] > > Which network driver are you using? > > Is there any packet loss? Run 'netstat -s | grep retransmited' to > check this.
I checked and I am using the e1000e on all affected systems. I checked on a squeeze system with the r8169 driver and the problem seems not to appear there. Your netstat command says: "4096 segments retransmited" before the wget and the same after it. I checked with mtr and ping multiple times that there was no packet loss, between and during the requests as part of my research in the past. Thorsten -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4e5e2ac7.2060...@anw.de