Lionel,
QIOASSIST has an effect on the zfcp driver and the network qeth driver,
since it provides a more efficient way to exploit the QDIO-architecture
when running Linux on z/VM. Unfortunately the current SLES10 Linux on
System z implementation contains a bug, which may result in traffic stall
conditions. This week we have provided a fix, which will be picked up by
the distributors. That means in future SLES10-versions there will no longer
be a need to disable QIOASSIST.
For now, disabling QIOASSIST means to switch back to the traditional usage
of QDIO. Thus the only disadvantage of disabling QIOASSIST for Linux under
z/VM is the non-exploitation of this z/VM feature.
Best regards,
Ursula Braun
IBM Germany, Linux on System z Dev.
IBM Deutschland Entwicklung GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschäftsführung: Herbert Kircher
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
"Lionel B. Dyck"
<[EMAIL PROTECTED]
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Sent by: Linux on [email protected]
390 Port cc
<[EMAIL PROTECTED]
IST.EDU> Subject
Disabling QIOASSIST for SLES 10 ?
12.07.2007 20:00
Please respond to
Linux on 390 Port
<[EMAIL PROTECTED]
IST.EDU>
We have been told to disable qioassist (#cp set qioassist off guest-name)
to resolve an issue with SLES10 (and we have to get sles10 sp1).
My question is: What are the disadvantages of doing so and what is the
best way to do so (on a guest by guest basis by placing the command in the
profile exec - or on a system wide basis and if so how)
Thanks
Lionel B. Dyck, Consultant/Specialist
Enterprise Platform Services, Mainframe Engineering
KP-IT Enterprise Engineering, Client and Platform Engineering Services
(CAPES)
925-926-5332 (8-473-5332) | E-Mail: [EMAIL PROTECTED]
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