On Wed, 2011-08-31 at 12:30 +0200, Thorsten Giese wrote: > Hello there, > > 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. Ben.
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