Re: Performance problems with squeeze kernel
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.
Thorsten
--
ANW GmbH & Co. KG
Holunderweg 2
66894 Bechhofen
Telefon 06372 8033190
Telefax 06372 8033191
E-Mail kontakt@anw.de
Internet www.anw.de
Sitz der Gesellschaft/Registered Office:
66894 Bechhofen, AG Zweibrücken HRA 30241
Persönlich haftende Gesellschafterin/
Partner with unlimited liability:
ANW Management GmbH, AG Zweibrücken HRB 30449
Geschäftsführung: Oliver Gab, Thorsten Giese
USt-ID/VAT-ID: DE241553575
Reply to: