We had to upgrade the ATI drivers on our RHEL 5 machine because of upgraded system packages, and unfortunately that broke our VirtualGL setup.
First we upgraded to 10.1, but that just made every GLX application crash (http://ati.cchtml.com/show_bug.cgi?id=1753). So we downgraded to 9.12, the last in the 9.x series. That made things work, but they are terribly slow. Example, using glxgears: Software, via Xvnc: 470 fps Local display: 7450 fps VirtualGL: 40 fps VirtualGL on local display: 40 fps I used the tracing function in vglrun and it shows a lot of time spent swapping buffers: [VGL] glXSwapBuffers (dpy=0x16073900(:2.0) drawable=0x02c00002 pbw->getdrawable()=0x00400002 ) 40.087223 ms [VGL] glXSwapBuffers (dpy=0x16073900(:2.0) drawable=0x02c00002 pbw->getdrawable()=0x00400002 ) 24.921894 ms [VGL] glXSwapBuffers (dpy=0x16073900(:2.0) drawable=0x02c00002 pbw->getdrawable()=0x00400002 ) 35.744190 ms Doing an strace shows that the time seems to be spent inside the kernel driver, waiting for something: 11:28:12.435458 ioctl(4, FIONREAD, [0]) = 0 11:28:12.435580 write(2, "[VGL] glXSwapBuffers (", 22[VGL] glXSwapBuffers () = 22 11:28:12.435627 write(2, "dpy=0x04981920(:2.0) ", 21dpy=0x04981920(:2.0) ) = 21 11:28:12.435670 write(2, "drawable=0x02c00002 ", 20drawable=0x02c00002 ) = 20 11:28:12.435721 write(10, "\3\3\2\0\2\0\300\2\16\0\2\0\2\0\300\2", 16) = 16 11:28:12.435767 read(10, 0x7fffbf8afa60, 32) = -1 EAGAIN (Resource temporarily unavailable) 11:28:12.435807 poll([{fd=10, events=POLLIN}], 1, -1) = 1 ([{fd=10, revents=POLLIN}]) 11:28:12.436253 read(10, "\1\0q\0\3\0\0\0\230\0\0\0\1\0\0\1\377\377\377\377\0\0\0\0\0\1\2\0\1\0\300\2", 32) = 32 11:28:12.436310 read(10, "1\200\352\0\0\0\0\0\0\0\0\0", 12) = 12 11:28:12.436363 read(10, "\1\30r\0\0\0\0\0\266\0\0\0\5\0\30\0,\1,\1\0\0\0\0\0\0\0\0\0\0\0\0", 32) = 32 11:28:12.436437 ioctl(6, 0xc03064a6, 0x7fffbf8aef00) = 0 11:28:12.436521 ioctl(6, 0xc03064a6, 0x7fffbf8aedc0) = 0 11:28:12.436572 ioctl(6, 0xc03064a6, 0x7fffbf8af590) = 0 11:28:12.461267 ioctl(6, 0xc03064a6, 0x7fffbf8afdc0) = 0 11:28:12.461330 write(2, "pbw->getdrawable()=0x00400002 ", 30pbw->getdrawable()=0x00400002 ) = 30 11:28:12.461379 write(2, ") 25.613070 ms\n", 15) 25.613070 ms ) = 15 I'm not sure what to do next, or if it's just a matter of sucking it up and try to get a support issue with ATI/AMD. Rgds -- Pierre Ossman OpenSource-based Thin Client Technology System Developer Telephone: +46-13-21 46 00 Cendio AB Web: http://www.cendio.com
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