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From: Vivek Goyal <vgoyal@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Miklos Szeredi <miklos@szeredi.hu>, Qian Cai <cai@lca.pw>,
	Hugh Dickins <hughd@google.com>,
	Matthew Wilcox <willy@infradead.org>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Linux-MM <linux-mm@kvack.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Amir Goldstein <amir73il@gmail.com>
Subject: Re: Possible deadlock in fuse write path (Was: Re: [PATCH 0/4] Some more lock_page work..)
Date: Fri, 16 Oct 2020 14:19:08 -0400	[thread overview]
Message-ID: <20201016181908.GA282856@redhat.com> (raw)
In-Reply-To: <CAHk-=wj0vjx0jzaq5Gha-SmDKc3Hnog5LKX0eJZkudBvEQFAUA@mail.gmail.com>

On Thu, Oct 15, 2020 at 02:21:58PM -0700, Linus Torvalds wrote:

[..]
> 
> I don't know why fuse does multiple pages to begin with. Why can't it
> do whatever it does just one page at a time?

Sending multiple pages in single WRITE command does seem to help a lot
with performance. I modified code to write only one page at a time
and ran a fio job with sequential writes(and random writes),
block size 64K and compared the performance on virtiofs.

NAME                    WORKLOAD                Bandwidth       IOPS
one-page-write          seqwrite-psync          58.3mb          933
multi-page-write        seqwrite-psync          265.7mb         4251

one-page-write          randwrite-psync         53.5mb          856
multi-page-write        randwrite-psync         315.5mb         5047

So with multi page writes performance seems much better for this
particular workload.

Thanks
Vivek



  parent reply	other threads:[~2020-10-16 18:19 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-13 19:59 [PATCH 0/4] Some more lock_page work Linus Torvalds
2020-10-13 20:03 ` Linus Torvalds
2020-10-14 13:05   ` Kirill A. Shutemov
2020-10-14 16:53     ` Linus Torvalds
2020-10-14 18:15       ` Matthew Wilcox
2020-10-15 10:41         ` Kirill A. Shutemov
2020-10-15  9:43       ` Kirill A. Shutemov
2020-10-15 16:44         ` Linus Torvalds
2020-10-14  5:50 ` Hugh Dickins
     [not found] ` <4794a3fa3742a5e84fb0f934944204b55730829b.camel@lca.pw>
2020-10-15  2:44   ` Linus Torvalds
2020-10-15 15:16     ` Possible deadlock in fuse write path (Was: Re: [PATCH 0/4] Some more lock_page work..) Vivek Goyal
2020-10-15 19:55       ` Vivek Goyal
2020-10-15 21:21         ` Linus Torvalds
2020-10-16 10:02           ` Miklos Szeredi
2020-10-16 12:27             ` Matthew Wilcox
2020-10-20 20:42             ` Vivek Goyal
2020-10-21  7:40               ` Miklos Szeredi
2020-10-21 20:12                 ` Vivek Goyal
2020-10-28 20:29                   ` Miklos Szeredi
2021-02-09 10:01                     ` Miklos Szeredi
2021-02-09 19:09                       ` Vivek Goyal
2020-10-16 18:19           ` Vivek Goyal [this message]
2020-10-16 18:24             ` Linus Torvalds
2020-10-16 18:24               ` Linus Torvalds
2020-10-16 23:03             ` Dave Chinner

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