Microsoft has slammed an analyst report in which IBM Communication Server beat Microsoft SNA Server hands down.
In the IBM-commissioned head-to-head between Communications Server 4.1 and SNA Server 2.11, the Microsoft product did particularly poorly. For example, in a single Pentium configuration, Communication Server offered twice the transaction load of SNA Sever running on a quad-Pentium.
Tom Uusnakki, program manager for the SNA Server product unit at Microsoft US, attacked the report and accused its author, the Tolly Group, of being unprofessional: " They used poor quality testing methods."
He also claimed that the Tolly Group refused to tune SNA Server and ran the comparisons using default settings for both gateway products instead.
Uusnakki claimed the benchmark test weighed in favour of the default setup for Communication Server 4.1. In the IBM set up, he said far fewer frames were passed between the host and the server gateway than with SNA Server.
Frames (or DLC windows) are used in gateway products to bundle communication packets between the mainframe host and client PC to reduce the number of interactions. Tuning involves careful monitoring of frames to and from the mainframe.
In a statement to PC Week, Tolly Group said it had run the two gateway products using a variety of DLC windows (ie different frame sizes) and had not detected any improvement in SNA Server performance.
Replying to Microsoft's accusations, Andy Hacker, senior engineer at the Tolly Group, said: "It's up to Microsoft to a give a better reason why it cannot achieve any better results."
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