Posts

15 Jan 2007
送某些造谣的人十四个字
一二三四五六七
孝悌忠信礼义廉
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15 Jan 2007
关于FreeBSD 6.2-RELEASE
感谢对岸国立交通大学资讯工程学系和台湾大学计算机与资讯网路中心提供的网络资源，ftp.cn.freebsd.org (a.k.a. ftp.freebsdchina.org)得以以2MB/s的速度完成了FreeBSD 6.2-RELEASE镜像传输。
在这里要告诉大家的是，目前为止，FreeBSD尚未官方正式公告此一版本之正式发布。在正式公告之前，请耐心等待，不要过早下载这一版本。
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15 Jan 2007
三类人
别人总结的。
一类可以做朋友，这类人绝对不能有（在我看来是）人品问题的问题；
一类可以做生意，这类人也许有一些在我看来是人品问题的问题，但是他们有底限；
还有一类既不能做朋友，也不能做生意，因为这些人连底限都没有。
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14 Jan 2007
DNS中的SRV记录
最近看代码时了解到的，顺手查了一下，在此留个记录：
SRV记录的作用是指明某域名下提供的服务。
例子：
_http._tcp.example.com. SRV 10 5 80. www.example.com
SRV后面项目的含义：
10 - 优先级，类似MX记录
5 - 权重
80 - 端口
www.example.com - 实际提供服务的主机名。
不过实际在Internet上用这个的似乎非常之少。
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12 Jan 2007
在tcpm上看到一篇论文
今天有人在IETF的tcpm上有人提到一篇《Misbehaving TCP Receivers Can Cause Internet-Wide Congestion Collapse》的论文。看起来是一个很有意思的问题，即，乐观ACK(opt-ack)在作者看来是一个潜在的DoS攻击工具，而且粗略地扫了一眼，这个问题很可能是真实存在的（但是这篇2005年11月的文章，目前似乎只有Sun做了回应……)，等周末有时间研究一下。
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10 Jan 2007
冒个泡……
没事，告诉大家我还活着，只是最近几天手上事情比较多。
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08 Jan 2007
说一个笑话，大家一乐
起初，他们只是不支持FreeBSD/Linux，我有Windows远程桌面，我没投诉；
到后来，他们不允许Windows远程桌面，我可以本地访问一台64位的Windows 2003 Server，勉强投诉两句，暂时也忍了；
再后来，他们又写了不支持64位Windows 2003 Server的所谓「安全」驱动，我拼命投诉，可是他们不理我了，更有人说，我是「小众系统」，正如一开始人们说FreeBSD/Linux两种系统一样。
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05 Jan 2007
ULE 2.0 hits -HEAD
Today, Jeff Roberson has committed his version 2.0 ULE scheduler. This new version has addressed several design issues as well as several bugs.
The new scheduler has adopted a circular queue, instead of the double-queue structure which is also found in the Linux O(1) scheduler. The latter has lead to difficulty implementing nice correctly.
For uniprocessor case, ULE is now faster.
MP algorithm has been simplified a bit.
A lot of bugfixes, etc.
To quote the original commit message:
ULE 2.0:
- Remove the double queue mechanism for timeshare threads. It was slow due to excess cache lines in play, caused suboptimal scheduling behavior with niced and other non-interactive processes, complicated priority lending, etc.
- Use a circular queue with a floating starting index for timeshare threads. Enforces fairness by moving the insertion point closer to threads with worse priorities over time.
- Give interactive timeshare threads real-time user-space priorities and place them on the realtime/ithd queue.
- Select non-interactive timeshare thread priorities based on their cpu utilization over the last 10 seconds combined with the nice value. This gives us more sane priorities and behavior in a loaded system as compared to the old method of using the interactivity score. The interactive score quickly hit a ceiling if threads were non-interactive and penalized new hog threads.
- Use one slice size for all threads. The slice is not currently dynamically set to adjust scheduling behavior of different threads.
- Add some new sysctls for scheduling parameters.
Bug fixes/Clean up:
- Fix zeroing of td_sched after initialization in sched_fork_thread() caused by recent ksegrp removal.
- Fix KSE interactivity issues related to frequent forking and exiting of kse threads. We simply disable the penalty for thread creation and exit for kse threads.
- Cleanup the cpu estimator by using tickincr here as well. Keep ticks and ltick/ftick in the same frequency. Previously ticks were stathz and others were hz.
- Lots of new and updated comments.
- Many many others.
Tested on: up x86/amd64, 8way amd64.
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01 Jan 2007
Conclusion, 2006
一直想找个时间总结一下。虽然本命年还没有结束，但是今天是2006年的最后一天，所以，确实是时候总结了。
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31 Dec 2006
嗔念
昨天戴大师语重心长地说，施主嗔念太重。
想想确实是。从最近招商银行的事、工作的事、学习的事，以及一些人提出的非分要求，加上让人心烦意乱的各种各样的事情，家人的一些不理解等等，时时有什么时候绷不住劲，恶狠狠地爆发一下的冲动。但正如另一位大师说的，爆发这种事情，尽量避免出现，因为首先成本比较高，其次未必有作用，更则伤人害己。
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