Kernel

For those who does not track FreeBSD-CURRENT -current@, Andre Opperamann (andre@) has just posted a new progress for his TCP/IP optimization:

An internal discussion happened in -developers@ has finally decided that we put ULE scheduler back to the “experimental” state, in order to reduce the number of reports about crashes and other bad things for it.

Currently the fact that ULE is not being actively maintained is the cause of this change. We hope that we can find someone who has interest on it. Additionally, it is worthy to have a look at David Xu’s new “CORE” scheduler (a ULE fork, using Linux’s algorithm).

总算支持了……这款声卡见于Dell Latitude D620/D820机型。

To quote Matthew Dillon:

While I hope to avoid any destabilization, I am fiddling with some pretty hairy code in the VM system so this is a head’s up!I have successfully implemented a basic MAP_VPAGETABLE feature that allows a mmap()’d section of memory to be governed by a virtual page table. Basically the backing store for the mmap()’d space is the‘physical memory’ used to map the space, and the mapping of the space is then governed by a ‘page table’ stored in that physical memory.(It is only physical memory from the point of view of the virtual kernel, not the real kernel of course). The mapping will store a physical page directory offset to tell the VM system where the page table is.

It seems that John Baldwin has published a debugging helper script for gdb, which is interesting to have a look at:

http://people.freebsd.org/~jhb/gdb.6

Maybe we can extend it to have some VM inspection function as well? :-)

It seems that my box loses its uptime record after I have migrated it to the Yizhuang IDC. The two things are related, but technically speaking, they are not. Actually I have discovered gokeeper’s hosts losed their uptimes as well, but I did not know why before. Sometimes I thought that was because the Linksys switch we have used, but there are some evidence that it is not; also I have at a point doubted the Cisco devices were misconfigured or have some firewalling features, but that’s not the answell, either.

今天 David Xu commit了他的新调度器(SCHED_CORE)，这个调度器基于ULE调度器，但改变了一系列算法。打算抽时间好好看一看代码。

OpenBSD实现了与FreeBSD不同的timeout功能。今天hack CARP的时候用到了，留个记号。

New Callout and Timer Facilities for NetBSD

Today Kip has announced that FreeBSD can now self-host (say complete the make buildworld, etc) on UltraSPARC T1 (Sun’s latest processor). The work is available on p4 at //depot/projects/kmacy_sun4v/… view.

[delphij@tarsier] ~> uname -a
FreeBSD tarsier.delphij.net 6.1-RELEASE FreeBSD 6.1-RELEASE #31: Sun May 7 00:55:05 CST 2006 delphij@tarsier.delphij.net:/usr/obj/usr/src/sys/TARSIER i386

希望很快就能正式公告了。