splited bio bypass the blk_queue_split(). Below is the patch
we used to fix this problem.
Thanks
From b5ea98c9fc5612f9390b65bd9cf4ff344b6cfe92 Mon Sep 17 00:00:00 2001
From: Jiale Li
Date: Mon, 4 Jul 2016 09:23:32 -0400
Subject: [PATCH] cgroup: Fix split bio been throttled more than once
From kernel
Hello,
On Mon, Jul 04, 2016 at 10:46:54PM +0800, Jiale Li wrote:
> These days, we have tested the cgroup blkio throttle function use fio,
> and we found a problem that when we use buffered IO or set the big block
> size like 1M, then the IO performance cannot reach the value we set.
> For example
pose
since all fast-cloned bio shares the same bvec table of the source bio.
Thanks,
Ming
>
> Thanks
>
> From b5ea98c9fc5612f9390b65bd9cf4ff344b6cfe92 Mon Sep 17 00:00:00 2001
> From: Jiale Li
> Date: Mon, 4 Jul 2016 09:23:32 -0400
> Subject: [PATCH] cgroup: Fix split bio
On Wed, Jul 6, 2016 at 6:26 AM, Tejun Heo wrote:
> Hello,
>
> On Mon, Jul 04, 2016 at 10:46:54PM +0800, Jiale Li wrote:
>> These days, we have tested the cgroup blkio throttle function use fio,
>> and we found a problem that when we use buffered IO or set the big block
>> size like 1M, then the IO
Hello, Ming.
On Wed, Jul 06, 2016 at 09:10:00AM +0800, Ming Lei wrote:
> > Then we did some research and find that in kernel version 4.3 brought in
> > blk_queue_split() function to split the big size bio into several parts,
> > and some of them are calling the generic_make_request() again, this r
On Wed, Jul 6, 2016 at 10:09 PM, Tejun Heo wrote:
> Hello, Ming.
>
> On Wed, Jul 06, 2016 at 09:10:00AM +0800, Ming Lei wrote:
>> > Then we did some research and find that in kernel version 4.3 brought in
>> > blk_queue_split() function to split the big size bio into several parts,
>> > and some o
On Thu, Jul 7, 2016 at 9:48 PM, aaronlee0817 wrote:
>>At 2016-07-06 22:09:19, "Tejun Heo" wrote:
>>Hello, Ming.
>>
>>On Wed, Jul 06, 2016 at 09:10:00AM +0800, Ming Lei wrote:
>>> > Then we did some research and find that in kernel version 4.3 brought
>>> > in
>>> > blk_queue_split() function to s
Hello, Ming.
On Fri, Jul 08, 2016 at 06:35:06PM +0800, Ming Lei wrote:
> I am wondering why REQ_THROTTLED is cleared for the original bio
> even it has been charged and will be issued to driver, and is it allowed
> to throttle and charge the same bio for many times?
So, IIUC, the flag is just to
On Sat, Jul 9, 2016 at 10:53 PM, Tejun Heo wrote:
> Hello, Ming.
>
> On Fri, Jul 08, 2016 at 06:35:06PM +0800, Ming Lei wrote:
>> I am wondering why REQ_THROTTLED is cleared for the original bio
>> even it has been charged and will be issued to driver, and is it allowed
>> to throttle and charge t
Hello,
On Wed, Jul 06, 2016 at 10:58:55PM +0800, aaronlee0817 wrote:
> >But that said, can't we just copy BIO_THROTLED while splitting?
>
> In my opinion， copying BIO_THROTLED while splitting doesn't work
> with this, because, the bio within the limit will not set BIO_THROTLED
> but will be split
On Wed, Jul 6, 2016 at 11:06 PM, Tejun Heo wrote:
> Hello,
>
> On Wed, Jul 06, 2016 at 10:58:55PM +0800, aaronlee0817 wrote:
>> >But that said, can't we just copy BIO_THROTLED while splitting?
>>
>> In my opinion， copying BIO_THROTLED while splitting doesn't work
>> with this, because, the bio wit
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