5u6 is faster than 5u7 (resp. 5u10) if we compare the performance of the GZIPInputStream with a multi threaded testcase.

Customer claims that on his v880 and v890 servers (4 CPUs resp. 4 cores) the multi threaded testcase is faster on 5u6 than on any other later update release.

The problem is reproducible. The following tests has been made on a SunBlade 2000 (2 CPUs, 2 Threads) on Solaris/sparc. The testcase is a multi threaded version of the single threaded testcase from CR 6507183.

java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Server VM (build 1.5.0_06-b05, mixed mode)
time: 12863
time: 12877
time: 12763

java version "1.5.0_07"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_07-b03)
Java HotSpot(TM) Server VM (build 1.5.0_07-b03, mixed mode)
time: 16620
time: 16336
time: 15949

java version "1.5.0_10"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03)
Java HotSpot(TM) Server VM (build 1.5.0_10-b03, mixed mode)
time: 16741
time: 16365
time: 16039

java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Server VM (build 1.6.0-b105, mixed mode)
time: 15408
time: 15605
time: 15746