Re: [iov_iter] 9bd0e337c6: will-it-scale.per_process_ops -4.8% regression

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To: kernel test robot <oliver.sang@xxxxxxxxx>
Subject: Re: [iov_iter] 9bd0e337c6: will-it-scale.per_process_ops -4.8% regression
From: David Howells <dhowells@xxxxxxxxxx>
Date: Fri, 04 Dec 2020 11:51:48 +0000
Cc: dhowells@xxxxxxxxxx, lkp@xxxxxxxxxxxx, lkp@xxxxxxxxx, ying.huang@xxxxxxxxx, feng.tang@xxxxxxxxx, zhengjun.xing@xxxxxxxxx, Pavel Begunkov <asml.silence@xxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20201203064536.GE27350@xsang-OptiPlex-9020>
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kernel test robot <oliver.sang@xxxxxxxxx> wrote:

> FYI, we noticed a -4.8% regression of will-it-scale.per_process_ops due to commit:
> 
> 
> commit: 9bd0e337c633aed3e8ec3c7397b7ae0b8436f163 ("[PATCH 01/29] iov_iter: Switch to using a table of operations")

Out of interest, would it be possible for you to run this on the tail of the
series on the same hardware?

Thanks,
David

Follow-Ups:
- Re: [iov_iter] 9bd0e337c6: will-it-scale.per_process_ops -4.8% regression
  - From: David Howells
- Re: [iov_iter] 9bd0e337c6: will-it-scale.per_process_ops -4.8% regression
  - From: Oliver Sang

References:
- [iov_iter] 9bd0e337c6: will-it-scale.per_process_ops -4.8% regression
  - From: kernel test robot

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