[OpenAFS] File systems on Linux, again.

[Matt Benjamin]

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Hey, Chas,

Sorry to bug.

I've been looking at this, tangentially, because I've been working with
bypassing dcache/memcache, writing direct into page cache.  Pretty far
along on that side of things.  Is rx locking so coarse that in general
only one read makes progress even independent of the cache--to your
knowledge?

Matt

chas williams - CONTRACTOR wrote:
> In message <E2E34866B20B824DA894CA53D1CF0DE204C9E912@ehost005-3.exch005intermed
> ia.net>,"Jerry Normandin" writes:
>> write performance is actually impressive.  file creation and deletion
>> are very slow on afs.
> 
> because writing is easier than reading.  the afs cache manager can
> group the outgoing writes together and send them in a single message.
> while the cache manager has readahead it doesnt work because the afs
> global locks blocks any progress the readahead thread might make.
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- --

Matt Benjamin

The Linux Box
206 South Fifth Ave. Suite 150
Ann Arbor, MI  48104

http://linuxbox.com

tel. 734-761-4689
fax. 734-769-8938
cel. 734-216-5309

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