Skip site navigation (1)Skip section navigation (2)
Date:      Fri, 10 Feb 2012 19:37:31 +0300
From:      Sergey Kandaurov <pluknet@gmail.com>
To:        Ed Schouten <ed@80386.nl>
Cc:        fs@freebsd.org
Subject:   Re: Increase timestamp precision?
Message-ID:  <CAE-mSOK2fo=PsvyQWW1Nz4XPqcr7fKDNCvVjHsUvR2uYmuqFMw@mail.gmail.com>
In-Reply-To: <20120210135527.GR1860@hoeg.nl>
References:  <20120210135527.GR1860@hoeg.nl>

next in thread | previous in thread | raw e-mail | index | archive | help
On 10 February 2012 17:55, Ed Schouten <ed@80386.nl> wrote:
> Hi all,
>
> It seems the default timestamp precision sysctl
> (vfs.timestamp_precision) is currently set to 0 by default, meaning we
> don't do any sub-second timestamps on files. Looking at the code, it
> seems that vfs.timestamp_precision=1 will let it use a cached value with
> 1 / HZ precision and it looks like it should have little overhead.
>
> Would anyone object if I were to change the default from 0 to 1?
>

[Yep, sorry I didn't read this mail before replying to your another mail.]

I am for this idea. Increasing vfs.timestamp_precision will allow
to use nanosecond precision for all those *stat() and *times()
syscalls which operate on struct timespec.

FWIW, NetBSD uses only nanotime() inside vfs_timestamp() since its
initial appearance in 2006.

-- 
wbr,
pluknet



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAE-mSOK2fo=PsvyQWW1Nz4XPqcr7fKDNCvVjHsUvR2uYmuqFMw>