* Cgroup: iops throttle problem @ 2016-07-18 13:35 张真 2016-07-20 15:30 ` Tejun Heo 0 siblings, 1 reply; 2+ messages in thread From: 张真 @ 2016-07-18 13:35 UTC (permalink / raw) To: tj, aaronlee0817, axboe, mlin, shli, linux-kernel, cgroup, linux-block, zhen1.zhang, yanzi.zhang, jiale0817.li SGVsbG8KTXkgbmFtZSBpcyBaaGVuIFpoYW5nICwgbWUgYW5kIEppYWxlIExpIHJlY2VudGx5IHRl c3QgYW5kIGFuYWx5emUgdGhlIGNncm91cApibGtpbyBmdW5jdGlvbnMuCldlIHRlc3RlZCB0aGUg YnVmZmVyZWQgcmVhZCBhIGZpbGUgdXNpbmcgYmlvIHdoZW4gdGhlIApibGtpby50aHJvdHRsZS5y ZWFkX2lvcHNfZGV2aWNlIGlzIHNldCAxMDAwLgpUaGUgZmlvIHJlc3VsdCBmaWxlIGRpc3BsYXlz IHRoZSBpb3BzIGlzIDEzNzIwIGxhcmdlciB0aGFuIDEwMDAgd2hlbiBibG9ja3NpemUgCmlzIDRL IGluIGZpby4KCldlIHNldCBkaWZmZXJlbnQgYmxvY2tzaXplIGluIGZpbzoKNEssIDhLICwgMTZL LCAzMkssIDY0SywgMTI4SywgMjU2SywgNTEySywgMTAyNEsKClRoZSBpb3BzIGluIGZpbzoKMTMw MzUsIDcyNTgsIDM3MTEsIDE2OTgsIDkwNywgNDYwLCAyMjgsIDEwMiwgNTQKV2hlbiBicyBpcyBs ZXNzIHRoYW4gNjRLLCB0aGUgaW9wcyBpcyBsYXJnZXIgdGhhbiAxMDAwLCB3aGVuIGJzIGlzIGxh cmdlciB0aGFuCjY0SywgdGhlIGlvcHMgaXMgbGVzcyB0aGFuIDEwMDAuCldlIHRlc3RlZCBpdCBv biB1YnVudHUgMTYuMDQgd2l0aCBrZXJuZWwgNC40LjAKCkRvc2UgdGhpcyBhIHByb2JsZW0gb2Yg YmxraW8gaW9wcyB0aHJvdHRsZT8KCgo= ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Cgroup: iops throttle problem 2016-07-18 13:35 Cgroup: iops throttle problem 张真 @ 2016-07-20 15:30 ` Tejun Heo 0 siblings, 0 replies; 2+ messages in thread From: Tejun Heo @ 2016-07-20 15:30 UTC (permalink / raw) To: 张真 Cc: aaronlee0817, axboe, mlin, shli, linux-kernel, cgroup, linux-block, zhen1.zhang, yanzi.zhang, jiale0817.li Hello, On Mon, Jul 18, 2016 at 09:35:12PM +0800, 张真 wrote: > Hello > My name is Zhen Zhang , me and Jiale Li recently test and analyze the cgroup > blkio functions. > We tested the buffered read a file using bio when the > blkio.throttle.read_iops_device is set 1000. > The fio result file displays the iops is 13720 larger than 1000 when blocksize > is 4K in fio. blk-throttle does allow bursts so the iops might go over the set limit for a short period. Over time, it shouldn't be over the set limit. > We set different blocksize in fio: > 4K, 8K , 16K, 32K, 64K, 128K, 256K, 512K, 1024K > > The iops in fio: > 13035, 7258, 3711, 1698, 907, 460, 228, 102, 54 Looks like you were hitting the natural bandwidth limit of the device. > When bs is less than 64K, the iops is larger than 1000, when bs is larger than > 64K, the iops is less than 1000. > We tested it on ubuntu 16.04 with kernel 4.4.0 > > Dose this a problem of blkio iops throttle? I don't know how the test was run but consistently going over the set limit isn't the expected behavior. Thanks. -- tejun ^ permalink raw reply [flat|nested] 2+ messages in thread
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