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Re: O->A loan
> On Mon, Nov 28, 2011 at 03:45:53AM +0000, YAMAMOTO Takashi wrote:
>> > 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 it's quite a bit out of date, but I think most of the changes needed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:
thanks. it seems that i've read the thread. :-)
what is the "pt" command used in the benchmark?
does it break loans?
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