That means that a lot of disk IO is being done and you've run out of threads and work queues. You'll want to start by analysing your IO patterns and seeing if you're maxing out your disk/controller/etc. If you are then you may find some COSS/AUFS tuning to optimise things, but its difficult to tell what from where I'm sitting. Adrian On Wed, Jun 18, 2008, liwei wrote: > Hi,all > > I got a lot of messages when I porting squid2.5 to squid2.6 > with coss,who know why? Thanks! > ======================================================================== > =============================================== > 2008/06/18 11:45:14| squidaio_queue_request: Async request queue growing > uncontrollably! > 2008/06/18 11:45:14| squidaio_queue_request: Syncing pending I/O > operations.. (blocking) > 2008/06/18 11:45:14| squidaio_queue_request: Synced > 2008/06/18 11:45:33| squidaio_queue_request: WARNING - Disk I/O > overloading > 2008/06/18 11:45:34| squidaio_queue_request: Async request queue growing > uncontrollably! > 2008/06/18 11:45:34| squidaio_queue_request: Syncing pending I/O > operations.. (blocking) > 2008/06/18 11:45:34| squidaio_queue_request: Synced > 2008/06/18 11:45:53| squidaio_queue_request: WARNING - Disk I/O > overloading > 2008/06/18 11:46:05| squidaio_queue_request: Async request queue growing > uncontrollably! > 2008/06/18 11:46:05| squidaio_queue_request: Syncing pending I/O > operations.. (blocking) > 2008/06/18 11:46:05| squidaio_queue_request: Synced -- - Xenion - http://www.xenion.com.au/ - VPS Hosting - Commercial Squid Support - - $25/pm entry-level VPSes w/ capped bandwidth charges available in WA -