mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 18:50:05 +01:00
kaf24@firebug.cl.cam.ac.uk
ac58fadfa5
several problems. It will now only read and write a transmit or receive descriptor once. It will correctly handle transmitting frames with more than two fragments. It will discard oversize frames instead of corrupting memory. I have tested all the changes I have made and even seen an improvement in receive performance from 1.7MB/s to 3.3MB/s. Your mileage will vary. The code could be simplified if multi-fragment frames were deleted. It appears that both Linux and Windows XP don't use fragmented frames. The mac crc computation code was deleted, since it has never been used. The code was checking the wrong bit in the control register. I tested type 3 descriptors by modifying the linux pcnet32 driver, but did not see any difference in performance over type 2 currently used. I have not made any change to type 0 (16-bit) transmit/receive descriptors as I have no way to test the changes. Please test this as soon as possible, as I will be on vacation next week and in a class the following week. I will check email from time to time, but my ability to make changes to code will be greatly dimished. One other thing I noticed in my testing, is that if I tell a linux domU to reboot, it will reboot but not have any pcnet32 device after rebooting. By doing a shutdown, xm destroy and xm create, I was able to get around that problem. Signed-off-by: Don Fry <brazilnut@us.ibm.com>
The QEMU x86 emulator
---------------------
INSTALLATION
------------
Type
./configure
make
to build qemu, qemu-CPU and libqemu.a (CPU is the name of the various
supported target CPUs).
Type
make install
to install QEMU in /usr/local
Tested tool versions
--------------------
In order to compile QEMU succesfully, it is very important that you
have the right tools. The most important one is gcc. I cannot guaranty
that QEMU works if you do not use a tested gcc version. Look at
'configure' and 'Makefile' if you want to make a different gcc
version work.
host gcc binutils glibc linux distribution
----------------------------------------------------------------------
x86 2.95.2 2.13.2 2.1.3 2.4.18
3.2 2.13.2 2.1.3 2.4.18
2.96 2.11.93.0.2 2.2.5 2.4.18 Red Hat 7.3
3.2.2 2.13.90.0.18 2.3.2 2.4.20 Red Hat 9
PowerPC 3.3 [4] 2.13.90.0.18 2.3.1 2.4.20briq
3.2
Alpha 3.3 [1] 2.14.90.0.4 2.2.5 2.2.20 [2] Debian 3.0
Sparc32 2.95.4 2.12.90.0.1 2.2.5 2.4.18 Debian 3.0
ARM 2.95.4 2.12.90.0.1 2.2.5 2.4.9 [3] Debian 3.0
[1] On Alpha, QEMU needs the gcc 'visibility' attribute only available
for gcc version >= 3.3.
[2] Linux >= 2.4.20 is necessary for precise exception support
(untested).
[3] 2.4.9-ac10-rmk2-np1-cerf2
[4] gcc 2.95.x generates invalid code when using too many register
variables. You must use gcc 3.x on PowerPC.
Documentation
-------------
Read the documentation in qemu-doc.html.
Fabrice Bellard.