lkml.org 
[lkml]   [1999]   [Apr]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: bad lmbench numbers for mmap
> From: torvalds@transmeta.com (Linus Torvalds)
[snip]
> Btw, that also explains why we're twice as slow as Solaris: Solaris
> probably does just one copy. Which is not very impressive either, as
> the proprt (2.3.x) way to do it is to do it without a single copy at
> all, and just write it out directly from the page cache page.

not likely. solaris VM is like SVR4, right ?(or rather, the other way
round). their writes go through page cache. their buffer cache is usually
used only for filesystem metadata. so there's no reason to do a copy. but
they have other overheads like having to map the page into kernel space
before doing IO (unlike linux which maps all physical mem, so this step
is trivial).

ganesh

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:51    [W:0.410 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site