hi, > On Mon, Nov 28, 2011 at 03:45:53AM +0000, YAMAMOTO Takashi wrote: >> hi, >> >> > On Sun, Nov 20, 2011 at 06:52:10PM +0000, YAMAMOTO Takashi wrote: >> >> hi, >> >> >> >> i'd like to to either fix or remove O->A page loaning. >> >> >> >> the biggest problem is the lack of users. thus no way to test. >> >> any ideas? >> > >> > some years ago I wrote some prototype code to use the O->A loaning for >> > read() and write(). the read() side worked, I don't think I had tested >> > the write() side so it probably has problems. the patch is still around: >> > ftp://ftp.netbsd.org/pub/NetBSD/misc/chs/diff.uvm_readloan.8 >> > >> > it's quite a bit out of date, but I think most of the changes needed >> > to update it would be mechanical. >> >> i'll take a look. thanks. >> >> did it (at least the read() side) have actual performance benefit >> compared to dumb copying? > > it helped quite a lot, yes. here's the email thread: > http://mail-index.netbsd.org/tech-kern/2005/02/15/0021.html
thanks. it seems that i've read the thread. :-) what is the "pt" command used in the benchmark? does it break loans? YAMAMOTO Takashi > > -Chuck
