On 08/28/2007 11:53 AM, Martin Knoblauch wrote: > > The basic setup is a dual x86_64 box with 8 GB of memory. The DL380 > has a HW RAID5, made from 4x72GB disks and about 100 MB write cache. > The performance of the block device with O_DIRECT is about 90 MB/sec. > > The problematic behaviour comes when we are moving large files through > the system. The file usage in this case is mostly "use once" or > streaming. As soon as the amount of file data is larger than 7.5 GB, we > see occasional unresponsiveness of the system (e.g. no more ssh > connections into the box) of more than 1 or 2 minutes (!) duration > (kernels up to 2.6.19). Load goes up, mainly due to pdflush threads and > some other poor guys being in "D" state.
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