Changes between Version 1 and Version 2 of jazz/08-11-15

Timestamp:

Nov 17, 2008, 1:04:28 AM (17 years ago)

Author:

jazz

Comment:

--

jazz/08-11-15

@@ +1 @@
+[[PageOutline]]
+
 = 2008-11-15 =
 
- * SC'08
+== Event: SC'08 ==
+
+ * [http://www.weather.com/weather/tenday/USTX0057?from=36hr_fcst10DayLink_undeclared Austin 近十日天氣預報]
+ * 展場無線網路測試:
+{{{
+C:\>tracert 140.110.1.1
+
+Tracing route to 140.110.1.1 over a maximum of 30 hops
+
+  1     2 ms    <1 ms    <1 ms  conf-rtr-south-vlan203.sc08.org [140.221.224.3]
+  2     3 ms     1 ms     1 ms  core-rtr-1-conf-rtr-south.sc08.org [140.221.251.114]
+  3    34 ms    33 ms    33 ms  nlr-la-rtr-core-rtr-1.sc08.org [140.221.251.134]
+  4    60 ms    58 ms    59 ms  seat-losa-49.layer3.nlr.net [216.24.186.13]
+  5    62 ms    60 ms    64 ms  twaren-1-is-jmb-776.lsanca.pacificwave.net [207.231.241.133]
+  6   294 ms   313 ms   313 ms  la-76-hc-gsr.twaren.net [211.79.48.229]
+  7   250 ms   313 ms   312 ms  hc-76-v20.twaren.net [211.79.60.113]
+  8   248 ms   313 ms   313 ms  140.110.1.1
+
+Trace complete.
+                             My traceroute  [v0.73]
+intrepid (0.0.0.0)                                     Sun Nov 16 00:54:03 2008
+Keys:  Help   Display mode   Restart statistics   Order of fields   quit
+                                       Packets               Pings
+ Host                                Loss%   Snt   Last   Avg  Best  Wrst StDev
+ 1. 172.21.253.2                      0.0%   259    0.3   0.3   0.2   6.1   0.4
+ 2. 140.110.1.1                       0.0%   259  226.3 279.1 221.1 1018.  61.5
+
+jazz@intrepid:~$ sudo iperf -c 140.110.240.192 -u
+------------------------------------------------------------
+Client connecting to 140.110.240.192, UDP port 5001
+Sending 1470 byte datagrams
+UDP buffer size:   122 KByte (default)
+------------------------------------------------------------
+[  3] local 172.21.253.152 port 33083 connected with 140.110.240.192 port 5001
+[ ID] Interval       Transfer     Bandwidth
+[  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec
+[  3] Sent 892 datagrams
+[  3] Server Report:
+[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
+[  3]  0.0- 9.9 sec  1.25 MBytes  1.05 Mbits/sec  2.526 ms    0/  891 (0%)
+[  3]  0.0- 9.9 sec  1 datagrams received out-of-order
+
+jazz@intrepid:~$ sudo iperf -c 140.110.240.192 -u -w 10M
+------------------------------------------------------------
+Client connecting to 140.110.240.192, UDP port 5001
+Sending 1470 byte datagrams
+UDP buffer size:   244 KByte (WARNING: requested 10.0 MByte)
+------------------------------------------------------------
+[  3] local 172.21.253.152 port 56643 connected with 140.110.240.192 port 5001
+[ ID] Interval       Transfer     Bandwidth
+[  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec
+[  3] Sent 893 datagrams
+[  3] Server Report:
+[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
+[  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec  0.670 ms    0/  893 (0%)
+}}}
+ * 展場光纖網路測試:
+{{{
+C:\>tracert 140.110.1.1
+
+Tracing route to 140.110.1.1 over a maximum of 30 hops
+
+  1    <1 ms    <1 ms    <1 ms  A-rtr.1851.sc08.org [140.221.141.1]
+  2    32 ms     1 ms    <1 ms  core-rtr-1-2-dnoc-rtr-2046-2.sc08.org [140.221.251.69]
+  3    32 ms    32 ms    32 ms  nlr-la-rtr-core-rtr-1.sc08.org [140.221.251.134]
+  4    58 ms    57 ms    57 ms  seat-losa-49.layer3.nlr.net [216.24.186.13]
+  5    60 ms    59 ms    59 ms  twaren-1-is-jmb-776.lsanca.pacificwave.net [207.231.241.133]
+  6   224 ms   225 ms   224 ms  la-76-tp-gsr.twaren.net [211.79.48.209]
+  7   226 ms   226 ms   226 ms  hc-76-v20.twaren.net [211.79.60.113]
+  8   227 ms   227 ms   227 ms  140.110.1.1
+
+Trace complete.
+
+jazz@intrepid:~$ sudo mtr 140.110.1.1
+
+                             My traceroute  [v0.73]
+intrepid (0.0.0.0)                                     Sun Nov 16 00:44:24 2008
+Resolver: Received error response 5. (refused by name server)elds   quit
+                                       Packets               Pings
+ Host                                Loss%   Snt   Last   Avg  Best  Wrst StDev
+ 1. 172.21.253.2                      0.0%   616    0.3   0.2   0.2   1.3   0.1
+ 2. 140.110.1.1                       0.0%   616  228.1 228.9 227.6 410.2  12.3
+
+jazz@intrepid:~$ sudo iperf -c 140.110.240.192 -u
+------------------------------------------------------------
+Client connecting to 140.110.240.192, UDP port 5001
+Sending 1470 byte datagrams
+UDP buffer size:   122 KByte (default)
+------------------------------------------------------------
+[  3] local 172.21.253.152 port 50095 connected with 140.110.240.192 port 5001
+[ ID] Interval       Transfer     Bandwidth
+[  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec
+[  3] Sent 893 datagrams
+[  3] Server Report:
+[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
+[  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec  1.975 ms    0/  892 (0%)
+[  3]  0.0-10.0 sec  1 datagrams received out-of-order
+
+jazz@intrepid:~$ sudo iperf -c 140.110.240.192 -u -w 10M
+------------------------------------------------------------
+Client connecting to 140.110.240.192, UDP port 5001
+Sending 1470 byte datagrams
+UDP buffer size:   244 KByte (WARNING: requested 10.0 MByte)
+------------------------------------------------------------
+[  3] local 172.21.253.152 port 53022 connected with 140.110.240.192 port 5001
+[ ID] Interval       Transfer     Bandwidth
+[  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec
+[  3] Sent 893 datagrams
+[  3] Server Report:
+[ ID] Interval       Transfer     Bandwidth       Jitter   Lost/Total Datagrams
+[  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec  1.827 ms    0/  893 (0%)
+}}}
+
+== BUGFIX: jfbterm ==
+
+ * [DRBL] jfbterm Bug
+   * https://bugs.launchpad.net/ubuntu/+source/jfbterm/+bug/253163
+   * http://launchpadlibrarian.net/16414131/jfbterm-segfault.txt
+   * http://launchpadlibrarian.net/16414135/jfbterm-segfault-strace.txt
+   * [測試]
+     * 安裝 [http://ftp.twaren.net/Linux/Ubuntu/ubuntu-cd/8.10/ubuntu-8.10-server-amd64.iso Ubuntu 8.10 Server AMD64]
+     * 
+{{{
+root@intrepid:~# apt-get update
+root@intrepid:~# apt-get upgrade
+root@intrepid:~# reboot
+root@intrepid:~# uname -a
+Linux intrepid 2.6.27-7-server #1 SMP Tue Nov 4 20:16:57 UTC 2008 x86_64 GNU/Linux
+root@intrepid:~# apt-get install jfbterm v86d
+root@intrepid:~# reboot
+root@intrepid:~# dpkg -S chvt
+kbd: /usr/share/man/man1/chvt.1.gz
+kbd: /bin/chvt
+root@intrepid:~# chvt 1
+root@intrepid:~# rmmod uvesafb
+ERROR: Module uvesafb does not exist in /proc/modules
+root@intrepid:~# modprobe uvesafb mode_option=1024x768
+root@intrepid:~# screen
+root@intrepid:~# jfbterm -e ls
+... 略 ...
+color 15 : ffff, ffff
+cannot mmap(mmio) : Invalid argument
+Segmentation fault
+}}}
+ * [備註] 如果沒有裝 v86d 的話，當執行 modprobe uvesafb 時會在 dmesg 看到以下資訊
+{{{
+[  703.839376] uvesafb: failed to execute /sbin/v86d
+[  703.840224] uvesafb: make sure that the v86d helper is installed and executable
+[  703.841494] uvesafb: Getting VBE info block failed (eax=0x4f00, err=-2)
+[  703.842307] uvesafb: vbe_init() failed with -22
+[  703.843019] uvesafb: probe of uvesafb.0 failed with error -22
+}}}
+ * [備註] 如果有裝 v86d 的話，當執行 modprobe uvesafb 時會在 dmesg 看到以下資訊
+{{{
+[  268.848377] uvesafb: VMware, IncVMware virtual machine2.0, VMware virtual machine2.0, 2.0, OEM: V M ware, Inc. VBE support 2.0VMware, IncVMware virtual machine2.0, VBE v2.0
+[  268.884099] uvesafb: no monitor limits have been set, default refresh rate will be used
+[  268.885202] uvesafb: VBE state buffer size cannot be determined (eax=0x0, err=0)
+[  268.885265] uvesafb: scrolling: redraw
+[  268.896617] mtrr: your processor doesn't support write-combining
+[  268.909303] Console: switching to colour frame buffer device 128x48
+[  269.938085] uvesafb: framebuffer at 0xf0000000, mapped to 0xffffc20000180000, using 16384k, total 16384k
+[  269.938101] fb0: VESA VGA frame buffer device
+}}}
+ * 
+{{{
+root@intrepid:~# modinfo uvesafb
+filename:       /lib/modules/2.6.27-7-server/kernel/drivers/video/uvesafb.ko
+description:    Framebuffer driver for VBE2.0+ compliant graphics boards
+author:         Michal Januszewski <spock@gentoo.org>
+license:        GPL
+srcversion:     21EDEFDED06E0673208A0D5
+depends:
+vermagic:       2.6.27-7-server SMP mod_unload modversions
+parm:           scroll:Scrolling mode, set to 'redraw', 'ypan', or 'ywrap' (scroll)
+parm:           vgapal:Set palette using VGA registers (invbool)
+parm:           pmipal:Set palette using PMI calls (bool)
+parm:           mtrr:Memory Type Range Registers setting. Use 0 to disable. (uint)
+parm:           blank:Enable hardware blanking (bool)
+parm:           nocrtc:Ignore CRTC timings when setting modes (bool)
+parm:           noedid:Ignore EDID-provided monitor limits when setting modes (bool)
+parm:           vram_remap:Set amount of video memory to be used [MiB] (uint)
+parm:           vram_total:Set total amount of video memoery [MiB] (uint)
+parm:           maxclk:Maximum pixelclock [MHz], overrides EDID data (ushort)
+parm:           maxhf:Maximum horizontal frequency [kHz], overrides EDID data (ushort)
+parm:           maxvf:Maximum vertical frequency [Hz], overrides EDID data (ushort)
+parm:           mode_option:Specify initial video mode as "<xres>x<yres>[-<bpp>][@<refresh>]" (charp)
+parm:           vbemode:VBE mode number to set, overrides the 'mode' option (ushort)
+parm:           v86d:Path to the v86d userspace helper. (string)
+
+root@intrepid:~# LANG=C apt-cache policy v86d
+v86d:
+  Installed: 0.1.5-1ubuntu2
+  Candidate: 0.1.5-1ubuntu2
+  Version table:
+ *** 0.1.5-1ubuntu2 0
+        500 http://tw.archive.ubuntu.com intrepid/universe Packages
+        100 /var/lib/dpkg/status
+
+root@intrepid:~# LANG=C apt-cache policy jfbterm
+jfbterm:
+  Installed: 0.4.7-7.2
+  Candidate: 0.4.7-7.2
+  Version table:
+ *** 0.4.7-7.2 0
+        500 http://tw.archive.ubuntu.com intrepid/universe Packages
+        100 /var/lib/dpkg/status
+}}}
+ * 追蹤 jfbterm 的 deb package 原始碼
+{{{
+root@intrepid:~# apt-get build-dep jfbterm
+root@intrepid:~# apt-get install dpkg-dev
+root@intrepid:~# apt-get source jfbterm
+}}}
+ * uvesafb 作者的推測:
+{{{
+As to why the console becomes unresponsive after exiting jfbterm --
+jfbterm sets KD_GRAPHICS mode on the console on which it is started,
+and apparently fails to set it back to KD_TEXT before segfaulting.  This
+leaves the console in the broken state.
+}}}
+ * 尋找合理懷疑對象:
+{{{
+root@intrepid:~/jfbterm-0.4.7# grep "KD_GRAPHICS" *
+vterm.c:        ioctl(0, KDSETMODE, KD_GRAPHICS);
+
+root@intrepid:~/jfbterm-0.4.7# grep "KD_TEXT" *
+main.c:        if (mode == KD_TEXT) {
+vterm.c:        ioctl(0, KDSETMODE, KD_TEXT);
+}}}