On Wed, 2011-08-31 at 14:36 +0200, Thorsten Giese wrote: > 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. [...] OK, so that narrows this down a bit. We're about to update e1000e in stable to add hardware support, but it may help with this problem as well. Can you test the appropriate package from <http://people.debian.org/~benh/packages/>? (The changes file contains checksums for all files and is signed by me.) Ben.
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