[Gluster-users] change fuse max_read= mount option from 128k to something bigger?

Anand Avati avati at gluster.com
Mon Oct 12 06:40:56 UTC 2009

The returns for the effort of increasing the fuse channel size is
hardly anything. Though you will see a nice increase in performance
when block size is increased, because of the reduction of context
switches, there will be a peak after which increasing the block size
further has no benefits. Since a transaction involves memcpy of the
buffers, the larger block sizes start becoming less friendly with your
hardware memory caches and start working against your performance.
>From our tests 128KB (the default maximum) is very ideal.


On Sun, Oct 11, 2009 at 6:55 AM,  <mki-glusterfs at mozone.net> wrote:
> Hi
> Are there any caveats to changing the max_read fuse mount option that's
> hardcoded into xlators/mount/fuse/src/fuse-bridge.c to something other
> than 128k?
> On my client test system, cat /proc/mounts shows:
> fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
> /storage fuse.glusterfs rw,relatime,user_id=0,group_id=0,default_permissions,allow_other,max_read=131072 0 0
> This is a deb (lenny) based x86_64 system, but the kernel is vanilla
> although the library is the default apt based
> libfuse-dev_2.7.4-1.1 one.
> Thanks.
> Mohan
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