Hi,
On Tue, Nov 10, 2015 at 02:58:32PM +0500, Eugene M. Zheganin wrote:
> Hi.
>
> my midnight commander is terribly slow at vieweing files with mcview.
> Opening of a file of approximately 10 megabytes takes about 30-40
> seconds. This isn't related with the compression setting, %busy wait or
> pool properties- I tested on various machines, it's fully reproducible.
> This lag appears on files about 1.5 megs in size, and the lag time is
> pretty constant. From my observation, it's the following syscall that's
> blocking:
>
> fstat(4,{ mode=p--------- ,inode=41,size=0,blksize=4096 }) = 0 (0x0)
> (observed using `truss mcview maillog`)
>
> If the file is viewed not by mcview (i.e. it is of a special type and
> viewed by the special utility, or mcview is simply not used - for
> example more opens same file without lag) - the file is opening fast as
> always. When mcview is involved - lag appears. In the same time I've
> never seen this lag on filesystems other than zfs.Is this happening on every ZFS FreeBSD install or just some of them? I'm running ZFS on FreeBSD 10-STABLE and I don't see this problem (even for much larger files). BR, Marko > And the most > beautiful detail is that this lag is repeatable on multiple opens of > same file - though you can expect that it will be only first time that > would be that slow, it doesn't happen - same pause occurs on sequential > opens. > > Who's issue is this ? > Can some workaround be used ? > > Thanks. > Eugene.
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