First approach on my laptop, quite significant.
Comparison of r/w from/to :
- the utility partition on the hd (fat32)
- the usb key
shows that read from the usb key is about 2 times slower than from the hard
disk, which is expected, whereas the write is about 20 times slower, which seems
in deed very wrong.
Thank you for your suggestions.
NB : this seems to indicate that it is not dependent on the 4M ram amount on my
workstation, nor on the fs itself.
Thank you in advance for any suggestion
hardware : laptop Dell Latitude D620
centrino core2 duo T7200 + 1024M ram
# scanpci -v
pci bus 0x0000 cardnum 0x1d function 0x07: vendor 0x8086 device 0x27cc
Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller
CardVendor 0x1028 card 0x01c2 (Dell, Card unknown)
STATUS 0x0290 COMMAND 0x0146
CLASS 0x0c 0x03 0x20 REVISION 0x01
BIST 0x00 HEADER 0x00 LATENCY 0x00 CACHE 0x00
BASE0 0xffa80000 addr 0xffa80000 MEM
MAX_LAT 0x00 MIN_GNT 0x00 INT_PIN 0x01 INT_LINE 0x09
# dmesg
Apr 8 09:11:19 vil4 usba: [ID 912658 kern.info] USB 2.0 device (usb8ec,8)
operating at hi speed (USB 2.x) on USB 2.0 root hub: [EMAIL PROTECTED],
scsa2usb1 at bus
address 5
Apr 8 09:11:19 vil4 usba: [ID 349649 kern.info] DaneElec z-PEN
0DF1A96051D22BC1
Apr 8 09:11:19 vil4 genunix: [ID 936769 kern.info] scsa2usb1 is
/[EMAIL PROTECTED],0/pci1028,[EMAIL PROTECTED],7/[EMAIL PROTECTED]
Apr 8 09:11:19 vil4 genunix: [ID 408114 kern.info]
/[EMAIL PROTECTED],0/pci1028,[EMAIL PROTECTED],7/[EMAIL PROTECTED] (scsa2usb1)
online
Apr 8 09:11:19 vil4 scsi: [ID 193665 kern.info] sd2 at scsa2usb1: target 0 lun
0
Apr 8 09:11:19 vil4 genunix: [ID 936769 kern.info] sd2 is
/[EMAIL PROTECTED],0/pci1028,[EMAIL PROTECTED],7/[EMAIL PROTECTED]/[EMAIL
PROTECTED],0
Apr 8 09:11:19 vil4 genunix: [ID 408114 kern.info]
/[EMAIL PROTECTED],0/pci1028,[EMAIL PROTECTED],7/[EMAIL PROTECTED]/[EMAIL
PROTECTED],0 (sd2) online
Apr 8 09:11:19 vil4 genunix: [ID 314293 kern.info] device
pci8086,[EMAIL PROTECTED](display#0) keeps up device [EMAIL
PROTECTED],0(disk#2), but the latter is not
power managed
# mount -v
/dev/dsk/c0d0s0 on / type ufs
read/write/setuid/devices/intr/largefiles/logging/xattr/onerror=panic/dev=1980000
on Tue Apr 8 08:25:58 2008
/dev/dsk/c0d0p1 on /mnt/DellUtility type pcfs
read/write/setuid/devices/hidden/nofoldcase/clamptime/atime/timezone=-3600/dev=1980011
on Tue Apr 8 08:42:05 2008
/dev/dsk/c3t0d0p0:1 on /media/z-PEN type pcfs
read/write/nosetuid/nodevices/hidden/nofoldcase/clamptime/noatime/timezone=-3600/dev=6c1090
on Tue Apr 8 09:11:22 2008
# df -h
/dev/dsk/c0d0p1 86M 68M 18M 79% /mnt/DellUtility
/dev/dsk/c3t0d0p0:1 1.9G 365M 1.6G 19% /media/z-PEN
# ls -l Desktop/R174292/Dell_multi-device_A17_R174292.exe
-rw-r--r-- 1 root root 56396160 Mar 29 15:48
Desktop/R174292/Dell_multi-device_A17_R174292.exe
copy to internal hd fat32
# time cp Desktop/R174292/Dell_multi-device_A17_R174292.exe
/mnt/DellUtility/pub/
real 0m5.714s
user 0m0.010s
sys 0m0.574s
copy from internal hd fat32
# time cp /mnt/DellUtility/pub/Dell_multi-device_A17_R174292.exe /tmp/
real 0m3.722s
user 0m0.009s
sys 0m0.570s
copy to usb 2.0 key fat32
# time cp Desktop/R174292/Dell_multi-device_A17_R174292.exe /media/z-PEN/
real 1m58.760s
user 0m0.009s
sys 0m0.358s
copy from usb 2.0 key fat32
# time cp /media/z-PEN/Dell_multi-device_A17_R174292.exe Desktop/
real 0m11.011s
user 0m0.008s
sys 0m0.345s
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