There are several regressions in the jetstream benchmark. The results can be viewed with the following link:

http://brana.sfbay:8080/query/nes.jsp?base=10732,10733,10734,10735,10736,10737,10738,10767,11646,11650,11678&build=11349,11350,11351,11352,11353,11354,11355,11356,11644,11645,11675&pval=0.01

Looking at xprof output, there seems to be more spent in compiled methods involed in the io and lang classes. Here are some xprof outputs that show this.

Solaris Sparc Client b06
 13.1% 94 + 0 java.io.BufferedReader.read
 12.0% 86 + 0 java.io.BufferedInputStream.read
 10.8% 77 + 0 java.io.BufferedOutputStream.write
  7.3% 52 + 0 java.io.StreamTokenizer.nextToken
  5.5% 39 + 0 java.lang.StringBuffer.append
  3.5% 25 + 0 sun.nio.cs.US_ASCII$Encoder.encodeArrayLoop
  3.4% 24 + 0 sun.nio.cs.US_ASCII$Decoder.decodeArrayLoop
  3.2% 21 + 2 java.lang.String.<init>
  3.1% 22 + 0 java.lang.Integer.getChars
  2.8% 20 + 0 java.lang.StringBuffer.toString
  2.7% 19 + 0 java.io.BufferedReader.readLine
  2.5% 18 + 0 WriteTextTest.writeFile3
  1.8% 13 + 0 java.lang.StringBuffer.append
  1.8% 13 + 0 java.io.StreamTokenizer.read
  1.7% 12 + 0 java.io.BufferedWriter.write
  1.5% 11 + 0 java.nio.Buffer.limit
  1.5% 11 + 0 java.lang.Integer.toString
  1.4% 10 + 0 java.lang.String.getChars
  1.4% 9 + 1 java.nio.CharBuffer.wrap
  1.1% 8 + 0 java.lang.Integer.appendTo
  1.1% 8 + 0 WriteTextTest.writeFile2
  1.0% 7 + 0 sun.nio.cs.StreamEncoder.write
  1.0% 7 + 0 java.nio.Buffer.<init>
  0.8% 6 + 0 CopyFileTest.copyFilesInDir
  0.8% 6 + 0 java.io.PrintWriter.write
 93.6% 666 + 3 Total compiled (including elided)

Solaris Sparc Client b07
14.0% 98 + 0 java.io.BufferedReader.read
 13.4% 94 + 0 java.io.BufferedOutputStream.write
  9.3% 65 + 0 java.io.BufferedInputStream.read
  6.8% 48 + 0 java.io.StreamTokenizer.nextToken
  5.0% 35 + 0 java.lang.String.<init>
  4.7% 33 + 0 sun.nio.cs.US_ASCII$Decoder.decodeArrayLoop
  3.7% 26 + 0 java.lang.StringBuffer.append
  3.3% 23 + 0 sun.nio.cs.US_ASCII$Encoder.encodeArrayLoop
  3.3% 23 + 0 java.lang.String.getChars
  3.1% 22 + 0 WriteTextTest.writeFile3
  2.8% 20 + 0 java.nio.CharBuffer.wrap
  2.8% 20 + 0 java.lang.Integer.getChars
  2.3% 16 + 0 java.io.BufferedReader.readLine
  2.1% 15 + 0 java.lang.Integer.toString
  1.6% 11 + 0 java.lang.StringBuffer.toString
  1.6% 11 + 0 java.lang.StringBuffer.append
  1.6% 11 + 0 java.io.BufferedWriter.write
  1.4% 10 + 0 CopyFileTest.copyFilesInDir
  1.4% 10 + 0 java.io.PrintWriter.write
  1.3% 9 + 0 java.io.StreamTokenizer.read
  1.1% 8 + 0 java.nio.Buffer.<init>
  1.1% 8 + 0 java.lang.Integer.appendTo
  1.0% 7 + 0 java.nio.charset.CharsetEncoder.encode
  0.9% 6 + 0 sun.nio.cs.StreamEncoder$CharsetSE.implWrite
  0.6% 4 + 0 sun.nio.cs.StreamEncoder.write
 94.6% 664 + 0 Total compiled (including elided)


Solaris i586 Server b06
 16.3% 59 + 0 CopyFileTest.copyFilesInDir
 14.9% 54 + 0 WriteTextTest.writeFile3
 13.5% 49 + 0 java.io.StreamTokenizer.nextToken
  8.3% 30 + 0 java.lang.String.valueOf
  3.6% 13 + 0 java.nio.charset.CharsetEncoder.encode
  3.6% 13 + 0 java.io.OutputStreamWriter.write
  1.9% 7 + 0 java.lang.StringBuffer.append
  1.9% 7 + 0 java.lang.String.<init>
  1.7% 5 + 1 java.lang.Integer.appendTo
  1.4% 5 + 0 java.io.OutputStreamWriter.write
  1.1% 4 + 0 sun.nio.cs.US_ASCII$Decoder.decodeArrayLoop
  0.6% 2 + 0 java.lang.Integer.getChars
  0.6% 2 + 0 ParseTextTest.runTest
  0.6% 2 + 0 java.nio.Buffer.<init>
  0.6% 2 + 0 java.io.BufferedReader.readLine
  0.6% 2 + 0 java.lang.String.copyValueOf
  0.3% 1 + 0 ReadTextTest.runTest
  0.3% 0 + 1 java.nio.charset.CharsetDecoder.decode
  0.3% 1 + 0 WriteTextTest.writeFile1
  0.3% 1 + 0 WriteTextTest.writeFile2
  0.3% 1 + 0 java.io.BufferedWriter.write
  0.3% 1 + 0 java.io.PrintWriter.newLine
  0.3% 1 + 0 java.io.BufferedOutputStream.write
 72.7% 262 + 2 Total compiled

* note that java.lang.Integer.toString does not show up in b06
Solaris i586 Server b07
 16.0% 58 + 0 WriteTextTest.writeFile3
 14.4% 52 + 0 CopyFileTest.copyFilesInDir
 13.8% 50 + 0 java.io.StreamTokenizer.nextToken
* 7.5% 27 + 0 java.lang.Integer.toString
  2.8% 10 + 0 java.nio.charset.CharsetEncoder.encode
  2.5% 9 + 0 java.io.OutputStreamWriter.write
  2.2% 8 + 0 java.io.StreamTokenizer.read
  2.2% 8 + 0 java.io.OutputStreamWriter.write
  1.9% 7 + 0 java.io.BufferedWriter.write
  1.9% 7 + 0 sun.nio.cs.US_ASCII$Decoder.decodeArrayLoop
  1.9% 7 + 0 java.lang.String.<init>
  1.9% 7 + 0 java.lang.StringBuffer.append
  1.4% 4 + 1 java.lang.Integer.appendTo
  1.4% 5 + 0 WriteTextTest.writeFile2
  0.6% 2 + 0 java.lang.Integer.getChars
  0.6% 2 + 0 java.io.BufferedInputStream.read
  0.6% 2 + 0 ReadTextTest.runTest
  0.6% 2 + 0 java.io.BufferedReader.readLine
  0.3% 1 + 0 adapters
  0.3% 1 + 0 vtable chunks
  0.3% 1 + 0 java.lang.String.copyValueOf
  0.3% 0 + 1 java.io.BufferedOutputStream.flushBuffer
 75.1% 270 + 2 Total compiled

Linux i586 Client b06
 13.0% 26 + 35 java.lang.StringBuffer.append
  9.1% 26 + 17 java.lang.String.<init>
  7.4% 18 + 17 java.lang.StringBuffer.toString
  6.6% 11 + 20 java.lang.String.getChars
  5.1% 24 + 0 java.io.StreamTokenizer.nextToken
  3.8% 16 + 2 WriteTextTest.writeFile3
  3.8% 15 + 3 java.lang.Integer.toString
  3.8% 18 + 0 sun.nio.cs.ISO_8859_1$Decoder.decodeArrayLoop
  3.8% 18 + 0 sun.nio.cs.ISO_8859_1$Encoder.encodeArrayLoop
  3.0% 14 + 0 java.io.BufferedOutputStream.write
  3.0% 14 + 0 java.io.BufferedReader.read
  2.8% 13 + 0 java.io.BufferedInputStream.read
  2.8% 6 + 7 java.lang.StringBuffer.append
  2.8% 13 + 0 java.lang.Integer.getChars
  2.6% 12 + 0 java.io.OutputStreamWriter.write
  2.3% 5 + 6 java.nio.CharBuffer.wrap
  2.3% 10 + 1 java.io.BufferedReader.readLine
  1.9% 9 + 0 java.nio.Buffer.limit
  1.9% 8 + 1 java.lang.Integer.appendTo
  1.5% 7 + 0 java.io.StreamTokenizer.read
  1.3% 6 + 0 java.io.BufferedWriter.write
  1.1% 5 + 0 java.nio.charset.CharsetEncoder.encode
  0.9% 4 + 0 sun.nio.cs.StreamEncoder.write
  0.6% 3 + 0 WriteTextTest.writeFile2
  0.6% 3 + 0 CopyFileTest.copyFilesInDir
 90.0% 314 + 109 Total compiled (including elided)

Linux i586 Client b07
 16.2% 42 + 34 java.lang.String.<init>
 13.6% 14 + 50 java.lang.String.getChars
  6.4% 29 + 1 java.lang.StringBuffer.append
  6.2% 29 + 0 sun.nio.cs.ISO_8859_1$Encoder.encodeArrayLoop
  4.1% 19 + 0 java.io.StreamTokenizer.nextToken
  3.4% 16 + 0 sun.nio.cs.ISO_8859_1$Decoder.decodeArrayLoop
  3.2% 13 + 2 java.lang.Integer.toString
  3.0% 14 + 0 java.nio.CharBuffer.wrap
  3.0% 4 + 10 java.lang.StringBuffer.append
  3.0% 14 + 0 java.io.BufferedInputStream.read
  2.6% 12 + 0 java.lang.Integer.getChars
  2.3% 7 + 4 java.lang.Integer.appendTo
  2.1% 10 + 0 java.io.BufferedReader.read
  2.1% 9 + 1 WriteTextTest.writeFile3
  1.9% 9 + 0 java.io.BufferedReader.readLine
  1.7% 8 + 0 java.io.BufferedOutputStream.write
  1.7% 8 + 0 WriteTextTest.writeFile2
  1.5% 7 + 0 java.nio.charset.CharsetEncoder.encode
  1.1% 5 + 0 java.io.StreamTokenizer.read
  1.1% 5 + 0 java.nio.Buffer.position
  1.1% 5 + 0 sun.nio.cs.StreamEncoder.write
  1.1% 5 + 0 java.lang.Integer.toString
  1.1% 4 + 1 java.io.BufferedWriter.write
  0.9% 4 + 0 java.io.OutputStreamWriter.write
  0.9% 4 + 0 java.nio.Buffer.limit
 90.2% 319 + 104 Total compiled (including elided)