Can't read session data

I am working with iAS6.0 SP4, distributed session
I perform a load test of 100 users,
For some of my sessions (about 3%), I can't read
the session data, all attributes are null.
Can someone help ?
Amir.

Are you sure you want to distribute sessions ? We experienced sever scaling issues with this options even on multi CPU machine. Check your KXS cpu utilisation using top command ( assuming Unix ).
This is because the distributed sessions are stored in kxs and lead to contention at high loads. You can chose for lite sessions by changing the web.xml of the application incase you do not need distributed sessions. If at all you want distributed sessions you may check the behaviour at lesser load

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