User Group Meeting Microsoft Read Write Review

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User Group MeetingMicrosoft Read Write Review

• July 13, 2001

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Microsoft Read Write Review

• We wanted to review the read/write buffer sizes
  when we mix Windows 98, 2000 and NT together.

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Setup Notes

• Network connection 10 Mb/s Half Duplex Ethernet
• Some charts were scaled down to 100s of
  milliseconds. Therefore the maximum theoretical
  throughput would be .125 MB or 1.25 Mb/s.

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Batch File To Simplify Testing
Test Identifier

• ECHO off
• CLS
• ECHO ABOUT TO MAP DRIVE.
• ECHO START SNIFFER IF YOU WANT TO CAPTURE THIS.
• ECHO.
• PAUSE
• NET USE T \\10.10.10.12\TEMP
• cls
• ECHO.
• ECHO ABOUT TO COPY THE FILE TO THE NT SERVER
• ECHO START SNIFFER IF YOU WANT TO CAPTURE THIS.
• ECHO.
• PAUSE
• COPY C\TEMP\TESTFILE T
• cls
• ECHO.

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Batch File To Simplify Testing
Test Identifier
ECHO. ECHO ABOUT TO DELETE THE FILE ON THE NT
SERVER ECHO START SNIFFER IF YOU WANT TO CAPTURE
THIS. ECHO. PAUSE DEL TTESTFILE cls ECHO. ECHO
ABOUT TO REMOVE THE DRIVE MAPPING ON THE NT
SERVER ECHO START SNIFFER IF YOU WANT TO CAPTURE
THIS. ECHO. PAUSE NET USE T /d PAUSE
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Filename List

• Test1.cap NT Workstation NT Server
• Test2.cap NT Workstation NT Server (changed
  SizReqBuf to 65,535 on Workstation)
• Test3.cap NT Workstation NT Server (changed
  SizReqBuf to 65,535 on Server)
• Test4.cap Win2000 Workstation NT Server
• Test5.cap Win2000 Workstation NT Server
  (changed SizReqBuf to 65,535 on Server)
• Test6.cap - NT Workstation Win2000 Server
• Test7.cap - Win2000 Workstation WIN2000 Server
• Test8.cap Win98 Workstation NT Server
• Test9.cap - Win98 Workstation - WIN2000 Server
• Test10.cap WinNT Workstation NT Server
  (changed SizReqBuf to 60,000 on Server)
• Test11.cap WinNT Workstation NT Server
  (changed SizReqBuf to 55,000 on Server)

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Frame Number for Results

• Step1 Step2 Step3 Step4 Step5
• Test1 0-5 6-2235 2236-4456 4457-4467 4468-4470
• Test2 1-15 16-2276 2277-4484 4485-4495 4496-4498
• Test3 0-14 15-2339 2340-4559 4560-4570 4571-4573
• Test4 0-27 28-2463 2481-4698 4699-4718
• Test5 0-28 29-2229 2230-4445 4446-2254
• Test6 0-16 17-2343 2344-4559 4560-4570 4571-4574
• Test7 0-39 40-2238 2239-4455 4456-4462
• Test8 0-19 20-2273 2274-4468 4469-4475 4476-4480
• Test9 0-23 24-2275 2276-4471 4472-4478 4479-4483
• Test10 0-14 15-2315 2316-4534 4535-4545
• Test 11 0-14 15-2248 2249-4492 4493-4503 4504-4506

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Number of Commands

• Reads Write
• Test1 63 35
• Test2 63 35
• Test3 63 68
• Test4 42 503
• Test5 42 34
• Test6 63 34
• Test7 42 34
• Test8 34 34
• Test9 34 34
• Test10 63 68
• Test 11 63 68

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Sniffer Notes
Same old Bug..
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Sniffer Notes
Whenever you create a filter and create a print
file, the output doesnt match what was in the
filtered trace.
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Work Around Option 1

• Just click the Save As.
• Select OK at the Next dialog screen.
• When prompted for a file name, Press Esc.
• Now create your Print File.

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Work Around Option 2

• Select whatever Display Filter
• Right click and choose Create New Filtered
  Window.
• Now create your Print File.

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Output File Note

• I found if you drag and drop at least 4 Trace
  Files from the File Manager into the Sniffer
  Application and then Create your Print File, the
  Output is back to the correct format.
• Sounds nuts, but seems to work for me... so far.

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How to Quickly Group the Reads and Writes ??

• Import the trace file into Excel. Make sure you
  kept the Summary information as an entire cell.
• Sort on Summary Information.
• Select the Summary Column and use the Data-Text
  to Columns function. Choose the Delimited option
  and use equals, space and comma as a delimiter,

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Microsoft Registry Change

• Locate and click the following key in the
  registry
• HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic
  es\lanmanserver\parameters
• On the Edit menu, click Add Value, and then add
  the following registry value
• Value Name SizReqBuf
• Data Type DWORD Value
• Radix Decimal
• Value 65535
• Quit Registry Editor.

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WINDOW Filters
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TCP WINDOW SIZE FILTER
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SMB READ FILTER
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SMB WRITE FILTER
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WIN NT Server
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WIN2K Server Charts
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