search for: bkl_count

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2010 Nov 18
9
Interesting problem with write data.
Hi, Recently, I made a btrfs to use. And I met slowness problem. Trying to diag it. I found this: 1. dd if=/dev/zero of=test count=1024 bs=1MB This is fast, at about 25MB/s, and reasonable iowait. 2. dd if=/dev/zero of=test count=1 bs=1GB This is pretty slow, at about 1.5MB/s, and 90%+ iowait, constantly. May I know why it works like this? Thanks. -- To unsubscribe from this list: send the
2017 Oct 18
2
Null deference panic in CentOS-6.5
...xffff88013bc11628, state = 0, start_pid = -1, start_site = 0x0, start_comm = "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" }, rq_sched_info = { pcount = 76248357, run_delay = 181146010801, last_arrival = 0, last_queued = 0, bkl_count = 0 }, rq_cpu_time = 3471141075664, yld_count = 673972, sched_switch = 0, sched_count = 149947296, sched_goidle = 72140963, ttwu_count = 76021337, ttwu_local = 18157697, bkl_count = 38109, stop = 0xffff882052c55540 }