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KernelTrap: Low Latency and Filesystems

Jul 14, 2004, 05:30 (2 Talkback[s])


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"Continuing the earlier discussion about low latency and Ingo Molnar's voluntary kernel preemption patch, the conversation moved onto the affect a filesystem can have on latency. Specifically, 2.6 maintainer Andrew Morton noted that ReiserFS was known to have some latency issues in both the 2.4 and 2.6 Linux kernels, 'resierfs: yes, it's a problem. I 'fixed' it multiple times in 2.4, but the fixes ended up breaking the fs in subtle ways and I eventually gave up.' However, he did go on to note, 'actually, the 2.4 low-latency patch does still have some reiserfs fixes, so it's probably better than reiserfs in 2.6.'

"When asked if ext3 was a better choice for low latency work, Andrew Morton replied, 'ext3 is certainly better than [reiserfs], but still has a couple of potential problem spots. ext2 is probably the best at this time...'"

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