Justin Piszcz wrote:
Kernel: 2.6.23-rc8 (older kernels do this as well)
When running the following command:
/usr/bin/time /usr/sbin/bonnie++ -d /x/test -s 16384 -m p34 -n
16:100000:16:64
It hangs unless I increase various parameters md/raid such as the
stripe_cache_size etc..
# ps auxww | grep D
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 276 0.0 0.0 0 0 ? D 12:14 0:00 [pdflush]
root 277 0.0 0.0 0 0 ? D 12:14 0:00 [pdflush]
root 1639 0.0 0.0 0 0 ? D< 12:14 0:00 [xfsbufd]
root 1767 0.0 0.0 8100 420 ? Ds 12:14 0:00
root 2895 0.0 0.0 5916 632 ? Ds 12:15 0:00
/sbin/syslogd -r
See the bottom for more details.
Is this normal? Does md only work without tuning up to a certain stripe
size? I use a RAID 5 with 1024k stripe which works fine with many
optimizations, but if I just boot the system and run bonnie++ on it
without applying the optimizations, it will hang in d-state. When I run
the optimizations, then it exits out of D-state, pretty weird?
Not at all. 1024k stripes are way outside the norm. If you do something way
outside the norm, and don't tune for it in advance, don't be terribly surprised
when something like bonnie++ brings your box to its knees.
That's not to say we couldn't make md auto-tune itself more intelligently, but
this isn't really a bug. With a sufficiently huge amount of RAM, you'd be able
to dynamically allocate the buffers that you're not pre-allocating with
stripe_cache_size, but bonnie++ is eating that up in this case.
-- Chris
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
