Home » Mailing list archives » linux-kernel » 2008 » September » 8

Re: Q: (2.6.16 & ext3) bad SMP load balancing when writing to ext3 on slow device

Previous thread: Re: kvm-intel + vista64 installer == BSOD. by Sebastian Herbszt on Saturday, September 6, 2008 - 11:05 am. (1 message)

Next thread: Re: [PATCH] genirq: irq_chip->startup() usage in setup_irq and set_irq_chained handler by Ingo Molnar on Saturday, September 6, 2008 - 11:37 am. (1 message)
[view original message]
From: Robert Hancock
Subject: Re: Q: (2.6.16 & ext3) bad SMP load balancing when writing to ext3 on slow device
Date: Saturday, September 6, 2008 - 11:15 am

They're not busy. IO wait means they have nothing to do other than wait 
for IO to complete. It's a bit surprising that you get so many pdflush 

--


[ message continues ]
[view original message]
From: Ulrich Windl
Subject: Re: Q: (2.6.16 & ext3) bad SMP load balancing when writing to ext3 on slow device
Date: Monday, September 8, 2008 - 12:44 am

Robert,

back to the question: Assuming the I/O is limited by the controller, communication 
channel and device, does it ever make any sense to start additional I/O daemons 
for a device that is already handled by a daemon and doesn't have an alternate 
communication channel (to make more dirty block go onto the device)? (Assuming no 
daemon servers more than one device).

Regards,


--


[ message continues ]
[view original message]
From: Robert Hancock
Subject: Re: Q: (2.6.16 & ext3) bad SMP load balancing when writing to ext3 on slow device
Date: Monday, September 8, 2008 - 7:36 am

I suspect this behavior may have already been changed, you may want to 
try a newer kernel and see..
--


[ message continues ]
Previous thread: Re: kvm-intel + vista64 installer == BSOD. by Sebastian Herbszt on Saturday, September 6, 2008 - 11:05 am. (1 message)

Next thread: Re: [PATCH] genirq: irq_chip->startup() usage in setup_irq and set_irq_chained handler by Ingo Molnar on Saturday, September 6, 2008 - 11:37 am. (1 message)