lkml.org 
[lkml]   [2020]   [Apr]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [LKP] [btrfs] 8d47a0d8f7: fio.write_bw_MBps -28.6% regression
On Fri, Apr 10, 2020 at 02:44:55PM +0800, Qu Wenruo wrote:
> On 2020/4/10 下午2:34, Xing Zhengjun wrote:
> > Hi Wenruo,
> >
> >    We test it in v5.6, the issue still exist, do you have time to take a
> > look at this? Thanks.
>
> This is expected.
>
> The extra check brings new overhead mostly equal to another CRC32 run.
>
> We believe it's worthy, as our read time tree checker has exposed quite
> some bit flip corruption.

The test probably runs on a PMEM device so there's no slowdown from the
actual IO and the in-memory checks are measurable, though 28% is a lot,
I'd expect something like 5-10% at most.

\
 
 \ /
  Last update: 2020-04-10 12:15    [W:0.053 / U:0.520 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site