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  <li>Assorted improvements and code cleanup:
  <ul>
+ <li>Huge performance improvements in the network stack, including:
+ <ul>
+ <li>Reduce per-packet mbuf tag allocation overhead in pf. This yields a
+ 100% improvement in pf performance.
+ <li>Packet forwarding can skip IPSEC stack if no IPSEC flows are defined. This
+ yields a further 5% improvement in packet forwarding performance.
+ <li>Skip TCP/UDP/ICMP/ICMP6 checksumming on incoming packets when not necessary.
+ This yields a further 10% improvement in pf performance.
+ <li>A change in the way the kernel random pool is stirred greatly increases
+ performance with network interface cards that support interrupt mitigation, especially
+ on architectures where reading the clock is expensive (such as amd64).
+ <li>Enable interrupt holdoff on <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=sis&sektion=4">sis(4)</a>
+ chips that support it. Significant performance gain for slower CPU devices with sis(4), such as Soekris.
+ </ul>
  <li>Large (&gt;1TB) disk and partition support in the disklabel and buffer cache
  code and in the userland utilities that manipulate disk blocks. Note
  that some parts of the system are not 64-bit disk block clean yet, so partition
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  <li>Thread support for the Objective-C library (libobjc).
  <li><a href="http://www.openbsd.org/cgi-bin/man.cgi?query=carp&sektion=4">carp</a>
  route handling has been fixed, solving some problems the routing daemons were exhibiting.
- <li>Various improvements in <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=pf&sektion=4">pf</a>
- increase performance drastically, stateful passing more than twice as fast than before.
- <li>A change in how the kernel random pool is stirred greatly increases performance
- with network interface cards that support interrupt mitigation.
  <li>i386 TLB handling improved to avoid possible corruption on Core2Duo processors.
  <li>i386 and amd64 use the BIOS disk geometry when creating default disklabels.
  <li>Default disk geometry changed from 64 heads/32 sectors to 255 heads/63 sectors.
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  alt="OpenBSD"></a>
  <a href="mailto:www@openbsd.org">www@openbsd.org</a>
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  alt="OpenBSD"></a>
  <a href="mailto:www@openbsd.org">www@openbsd.org</a>
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! $OpenBSD: 42.html,v 1.56 2007/09/06 22:49:01 cloder Exp $
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