Messages in this thread | | | Date | Wed, 29 Aug 2007 12:25:06 -0400 | From | Chuck Ebbert <> | Subject | Re: Understanding I/O behaviour - next try |
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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.
Try booting with "mem=4096M", "mem=2048M", ... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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