Comment 95 for bug 607560

when I download a xml on firefox,it's about 1MB size,but firefox will be gray window,and system becomeslow down ,I type 'sudo iotop' on the terminal , jbd2/sdb3-8 is 98%io,jbd2 writing the disk all time,my disk is alway full work.my system is ubuntu 12.04 lts,Linux IT-Department 3.2.0-38-generic #61-Ubuntu SMP Tue Feb 19 12:18:21 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux