User Group Meeting

Microsoft Read Write Review

July 13, 2001

Microsoft Read Write Review• We wanted to review the read/write buffer sizes

when we mix Windows 98, 2000 and NT together.

Setup Notes• Network connection 10 Mb/s – Half Duplex

Ethernet

• Some charts were scaled down to 100’s of milliseconds. Therefore the maximum theoretical throughput would be .125 MB or 1.25 Mb/s.

Batch File To Simplify TestingECHO offCLSECHO ABOUT TO MAP DRIVE. ECHO START SNIFFER IF YOU WANT TO CAPTURE THIS.ECHO.PAUSENET USE T: \\10.10.10.12\TEMPcls

ECHO.ECHO ABOUT TO COPY THE FILE TO THE NT SERVERECHO START SNIFFER IF YOU WANT TO CAPTURE THIS.ECHO.PAUSECOPY C:\TEMP\TESTFILE T:cls

ECHO.ECHO ABOUT TO COPY THE FILE from THE NT SERVERECHO START SNIFFER IF YOU WANT TO CAPTURE THIS.ECHO.PAUSECOPY T:testfile c:\temp\testfile.newdel c:\temp\testfile.newcls

1

2

3

Test Identifier

Batch File To Simplify Testing

ECHO.ECHO ABOUT TO DELETE THE FILE ON THE NT SERVERECHO START SNIFFER IF YOU WANT TO CAPTURE THIS.ECHO.PAUSEDEL T:TESTFILEcls

ECHO.ECHO ABOUT TO REMOVE THE DRIVE MAPPING ON THE NT SERVERECHO START SNIFFER IF YOU WANT TO CAPTURE THIS.ECHO.PAUSENET USE T: /dPAUSE

4

5

Test Identifier

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)

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

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

Sniffer NotesSame old Bug..

Sniffer Notes

Whenever you create a filter and create a print file, the output doesn’t match what was in the filtered trace.

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.

Work Around Option 2

• Select whatever Display Filter

• Right click and choose Create New Filtered Window.

• Now create your Print File.

Output File NoteI 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.

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,

Microsoft Registry Change• Locate and click the following key in the registry:• HKEY_LOCAL_MACHINE\SYSTEM\

CurrentControlSet\Services\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.

WINDOW Filters

TCP WINDOW SIZE FILTER

SMB READ FILTER

SMB WRITE FILTER

WIN NT Server

Read Write Comparison Win NT Client & Win NT Server

0

10000

20000

30000

40000

50000

60000

70000

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63

Number of Commands

Byt

es

Read Write

Read Write ComparisonWIN 2000 Client & WIN NT Server

-

10,000

20,000

30,000

40,000

50,000

60,000

70,000

1 16 31 46 61 76 91 106

121

136

151

166

181

196

211

226

241

256

271

286

301

316

331

346

361

376

391

406

421

436

451

466

481

496

Number or Commands

Byt

es

Read Write

Read Write ComparisonWIN 2000 Client & WIN NT Server (SizReqBuf=65,535)

-

10,000

20,000

30,000

40,000

50,000

60,000

70,000

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

Number of Commands

Byt

es

Read Write

Read Write ComparisonWin NT Client to NT Server (SizReqBuf=65,535)

-

10,000

20,000

30,000

40,000

50,000

60,000

70,0001 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67

Number of Commands

Byt

es

Read Write

Read Write ComparisonWin NT Client (Changed SizReqBuf to 65,535) & Server

-

10,000

20,000

30,000

40,000

50,000

60,000

70,000

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63

Number Of Commands

Byt

es

Read Write

WIN2K Server Charts

Read Write ComparisonWIN 2000 Client & WIN 200 Server

-

10,000

20,000

30,000

40,000

50,000

60,000

70,000

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

Number of Commands

Byt

es

Read Write

Read Write ComparisonWIN NT Client & WIN 2000 Server

-

10,000

20,000

30,000

40,000

50,000

60,000

70,000

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63

Number of Commands

Byt

es

Read Write