Red Hat ENTERPRISE LINUX 5.5 - S 2010, Manual

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virtio-win
325
• Running some user-space probe test cases provided by the
systemtap-testsuite
package fail
with an
Unknown symbol in module
error on some architectures. These test cases include (but
are not limited to):
•
systemtap.base/uprobes.exp
•
systemtap.base/bz10078.exp
•
systemtap.base/bz6850.exp
•
systemtap.base/bz5274.exp
Because of a known bug in the latest SystemTap update, new SystemTap installations do not unload
old versions of the
uprobes.ko
module. Some updated user-space probe tests provided by the
systemtap-testsuite package use symbols available only in the latest
uprobes.ko
module (also
provided by the latest SystemTap update). As such, running these user-space probe tests result in
the error mentioned earlier.
If you encounter this error, simply run
rmmod uprobes
to manually remove the older
uprobes.ko
module before running the user-space probe test again.
(BZ#499677)
122
• SystemTap currently uses GCC to probe user-space events. GCC is, however, unable to provide
debuggers with precise location list information for parameters. In some cases, GCC also fails to
provide visibility on some parameters. As a consequence, SystemTap scripts that probe user-space
may return inaccurate readings.
(BZ#239065)
123
5.28. virtio-win
VirtIO para-virtualized Windows(R) drivers for 32-bit and 64-bit Windows (R) guests.
• Low performance with UDP messages larger than 1024 is a known Microsoft issue:
http://
support.microsoft.com/default.aspx/kb/235257
. For the message larger than 1024 bytes follow the
workaround procedure detailed in the above Microsoft knowledgebase article.
(BZ#496592)
124
• Installation of Windows XP with the floppy containing guest drivers (in order to get the virtio-net
drivers installed as part of the installation), will return messages stating that the viostor.sys file could
not be found. viostor.sys is not part of the network drivers, but is on the same floppy as portions of
the virtio-blk drivers. These messages can be safely ignored, simply accept the installation's offer to
reboot, and the installation will continue normally.
BZ#513160
125
5.29. xorg-x11-drv-i810
xorg-x11-drv-i810 is an Intel integrated graphics video driver for the X.Org implementation of the X
Window System.
• Running a screensaver or resuming a suspended laptop with an external monitor attached
may result in a blank screen or a brief flash followed by a blank screen. If this occurs with the
screensaver, the prompt for your password is being obscured, the password can still be entered
blindly to get back to the desktop. To work around this issue, physically disconnect the external
monitor and then press the video hotkey (usually Fn-F7) to rescan the available outputs, before
suspending the laptop.