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On Sun, Sep 22 2002, Andrew Morton wrote: > +read-latency.patch > > Fix the writer-starves-reader elevator problem. This is basically > the read_latency2 patch from -ac kernels. > > On IDE it provides a 100x improvement in read throughput when there > is heavy writeback happening. 40x on SCSI. You need to disable Ah interesting. I do still think that it is worth to investigate _why_ both elevator_linus and deadline does not prevent the read starvation. The read-latency is a hack, not a solution imo. > tagged command queueing on scsi - it appears to be quite stupidly > implemented. Ahem I think you are being excessively harsh, or maybe passing judgement on something you haven't even looked at. Did you consider that you _drive_ may be the broken component? Excessive turn-around times for request when using deep tcq is not unusual, by far. -- Jens Axboe - 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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