Re: read/write slow on nvme drive - Supermicro X10DRL-CT

["D'Arcy J.M. Cain" <darcy%NetBSD.org@localhost>]

On Thu, 11 Aug 2016 12:17:20 -0400
Thor Lancelot Simon <tls%panix.com@localhost> wrote:
> > Given the /mnt entry I assume that this is a test system so go ahead
> > and change "rw" to "rw,log" and reboot.  May as well change both and
> > test both.  Make sure that your kernel has "options WAPBL".  The
> > GENERIC one does.  
> 
> Why?  The writes to the SSD should be so fast that the overhead of
> double-writing the metadata, synchronizing the cache, etc. should
> considerably exceed any delay from synchronously writing the metadata
> once...

Probably.  I am just suggesting that he test it.  Personally I would be
interested in seeing the comparison.  Perhaps, as you suggest, it makes
it slower.  That would be a good data point to have.

-- 
D'Arcy J.M. Cain <darcy%NetBSD.org@localhost>
http://www.NetBSD.org/ IM:darcy%Vex.Net@localhost