On Wed, 2011-08-31 at 20:43 +0200, Thorsten Giese wrote: > Am 31.08.2011 14:48, schrieb Ben Hutchings: > > 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. > > [...] > > > > 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.) > > I installed your kernel an the problem persists. No luck here, sorry. > > When the server is powered up (e.g. for the new kernel, there is a short > time, where it seems to work, but then after about 4-5 requests (2-3 > minutes) it stops working correctly and shows the problems as described > above. Please use the 'reportbug' program to submit a bug on the kernel package. This should automatically include various useful system information. Ben.
Attachment:
signature.asc
Description: This is a digitally signed message part