xfs quota vs. performance

[lubos klokner <lubos@xxxxxxxxxx>]

hello,

we have 7 servers (web and shell) accesing one xfs (500gb) storage via
nfs. it is free webhosing and have about 60000 users/directories on
the storage. there is 60-70mbit/s nfs traffic outgoing from storage.
now we need to setup quota.
my question is: how much prerformance will i lost when we turn on quota
?

thank you for any opinions.

best regards,
-- 
lubos klokner <lubos@xxxxxxxxxx>