lkml.org 
[lkml]   [2012]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3 14/16] Gut bio_add_page()
On Tue, May 29, 2012 at 11:54:38AM +1000, Dave Chinner wrote:
> It also allowed us to build IOs that span
> entire RAID stripe widths, thereby avoiding potential RAID RMW
> cycles, and even allowing high end raid controllers to trigger BBWC
> bypass fast paths that could double or triple the write throughput
> of the arrays...

merge_bvec_fn has nothing to do with that though, since for one there
aren't any merge_bvec_fn's being called in the IO paths on these high
end disk arrays, and for our software raid implementations their
merge_bvec_fns will keep you from sending them bios that span entire
stripes.


\
 
 \ /
  Last update: 2012-05-29 06:21    [from the cache]
©2003-2011 Jasper Spaans