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As an extra data point, redoing the same test using the raw device
(bypassing the filesystem) yields no problems, but poor
read speed (with the version 4 iscsi driver I'm usually in the 160
MB/sec range)
Valerio
===
root@titus:~/linux-iscsi-5.0.0.3rc1-255# dt of=/dev/sdc1 bs=8k
limit=5000m
Write Statistics:
Total records processed: 640000 @ 8192 bytes/record (8.000 Kbytes)
Total bytes transferred: 5242880000 (5120000.000 Kbytes, 5000.000
Mbytes)
Average transfer rates: 54733062 bytes/sec, 53450.256 Kbytes/sec
Number I/O's per second: 6681.282
Total passes completed: 0/1
Total errors detected: 0/1
Total elapsed time: 01m35.79s
Total system time: 00m27.26s
Total user time: 00m10.68s
Starting time: Thu May 5 10:28:27 2005
Ending time: Thu May 5 10:30:02 2005
Read Statistics:
Total records processed: 640000 @ 8192 bytes/record (8.000 Kbytes)
Total bytes transferred: 5242880000 (5120000.000 Kbytes, 5000.000
Mbytes)
Average transfer rates: 11039966 bytes/sec, 10781.217 Kbytes/sec
Number I/O's per second: 1347.652
Total passes completed: 1/1
Total errors detected: 0/1
Total elapsed time: 07m54.90s
Total system time: 00m35.77s
Total user time: 00m21.41s
Starting time: Thu May 5 10:28:27 2005
Ending time: Thu May 5 10:38:03 2005
Total Statistics:
Output device/file name: /dev/sdc1 (device type=disk)
Type of I/O's performed: sequential (forward)
Data pattern read/written: 0x39c39c39
Total records processed: 1280000 @ 8192 bytes/record (8.000 Kbytes)
Total bytes transferred: 10485760000 (10240000.000 Kbytes,
10000.000 Mbytes)
Average transfer rates: 18173839 bytes/sec, 17747.890 Kbytes/sec
Number I/O's per second: 2218.486
Total passes completed: 1/1
Total errors detected: 0/1
Total elapsed time: 09m36.97s
Total system time: 01m04.84s
Total user time: 00m32.09s
Starting time: Thu May 5 10:28:27 2005
Ending time: Thu May 5 10:38:04 2005
===
On Thu, 2005-05-05 at 10:24 -0600, Valerio Aimale wrote:
> Hello everybody,
>
> today I tried, for the first time, the linux-iscsi-5.0.0.3rc1-255 driver
> on a P4 debian with kernel 2.6.11-1-686 connected to a VTrak 15200
>
> I usually test the speed of the iscsi device with 'dt' and never had any
> error reported with previous versions.
>
> Today I saw this:
>
> ===
> root@titus:~/dt.d# dt of=/mnt/iscsi/x bs=8k limit=5000m
>
> Write Statistics:
> Total records processed: 640000 @ 8192 bytes/record (8.000 Kbytes)
> Total bytes transferred: 5242880000 (5120000.000 Kbytes, 5000.000
> Mbytes)
> Average transfer rates: 31006446 bytes/sec, 30279.733 Kbytes/sec
> Number I/O's per second: 3784.967
> Total passes completed: 0/1
> Total errors detected: 0/1
> Total elapsed time: 02m49.09s
> Total system time: 00m10.32s
> Total user time: 00m10.12s
> Starting time: Thu May 5 10:17:26 2005
> Ending time: Thu May 5 10:20:16 2005
>
>
> dt: Error number 1 occurred on Thu May 5 10:20:19 2005
> dt: Elapsed time since beginning of pass: 00m02.98s
> dt: Elapsed time since beginning of test: 02m52.07s
> dt: Data compare error at byte 928 in record number 5616
> dt: Relative block number where the error occcured is 89841 (offset 416)
> dt: Data expected = 0x39, data found = 0, byte count = 8192
> dt: The correct data starts at address 0x8066018 (marked by asterisk
> '*')
> dt: Dumping Pattern Buffer (base = 0x8066018, offset = 0, limit = 4
> bytes):
>
> 0x8066018 *39 9c c3 39
>
> dt: The incorrect data starts at address 0x80693a0 (marked by asterisk
> '*')
> dt: Dumping Data Buffer (base = 0x8069000, offset = 928, limit = 64
> bytes):
>
> 0x8069380 39 9c c3 39 39 9c c3 39 39 9c c3 39 39 9c c3 39
> 0x8069390 39 9c c3 39 39 9c c3 39 39 9c c3 39 39 9c c3 39
> 0x80693a0 *00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x80693b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> Read Statistics:
> Total records processed: 5616 @ 8192 bytes/record (8.000 Kbytes)
> Total bytes transferred: 46006272 (44928.000 Kbytes, 43.875 Mbytes)
> Average transfer rates: 15438346 bytes/sec, 15076.510 Kbytes/sec
> Number I/O's per second: 1884.564
> Total passes completed: 1/1
> Total errors detected: 1/1
> Total elapsed time: 00m02.98s
> Total system time: 00m00.04s
> Total user time: 00m00.17s
> Starting time: Thu May 5 10:17:26 2005
> Ending time: Thu May 5 10:20:19 2005
>
>
> Total Statistics:
> Output device/file name: /mnt/iscsi/x (device type=regular)
> Type of I/O's performed: sequential (forward)
> Data pattern read/written: 0x39c39c39
> Total records processed: 645616 @ 8192 bytes/record (8.000 Kbytes)
> Total bytes transferred: 5288886272 (5164928.000 Kbytes, 5043.875
> Mbytes)
> Average transfer rates: 30736830 bytes/sec, 30016.435 Kbytes/sec
> Number I/O's per second: 3752.054
> Total passes completed: 1/1
> Total errors detected: 1/1
> Total elapsed time: 02m52.07s
> Total system time: 00m10.36s
> Total user time: 00m10.29s
> Starting time: Thu May 5 10:17:26 2005
> Ending time: Thu May 5 10:20:19 2005
>
> ===
>
> dmesg did not report any error for the module.
>
> It appears to be repeatable, as it happens with every run. Please let me
> know if I can be of any assistance to further explore this.
>
> Valerio
>
>
>
>
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