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From: Chris Murphy <lists@colorremedies.com>
To: Chris Murphy <lists@colorremedies.com>
Cc: Nikolay Borisov <nborisov@suse.com>,
	Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: 5.6, slow send/receive, < 1MB/s
Date: Mon, 4 May 2020 02:43:32 -0600	[thread overview]
Message-ID: <CAJCQCtSCzD-RtGH1tJjNN=PBgUfJARy0r1p1Ln0pU1eRNTmR9w@mail.gmail.com> (raw)
In-Reply-To: <CAJCQCtT6rnH75f8wC8uf+-NnxEsZtmoRhM9cE37QTR0TF6xqJQ@mail.gmail.com>

Samples
  Children      Self  Shared Objec  Symbol
-   97.03%     0.01%  [kernel]      [k] entry_SYSCALL_64_after_hwframe

                              ◆
   - 52.00% entry_SYSCALL_64_after_hwframe

                              ▒
      - 51.95% do_syscall_64

                              ▒
         - 44.40% __x64_sys_splice

                              ▒
            - 65.95% do_splice

                              ▒
               - 31.93% mutex_unlock

                              ▒
               - 16.82% pipe_double_lock

                              ▒
                  - 10.75% mutex_lock

                              ▒
                     - 3.90% _cond_resched

                              ▒
                          1.52% rcu_all_qs

                              ▒
                  - 3.49% __mutex_lock.constprop.0

                              ▒
                       3.19% mutex_spin_on_owner

                              ▒
               - 9.99% mutex_lock

                              ▒
                  - 3.30% _cond_resched

                              ▒
                       1.07% rcu_all_qs

                              ▒
                 2.16% pipe_unlock

                              ▒
               - 1.27% __mutex_lock.constprop.0

                              ▒
                    1.25% mutex_spin_on_owner

                              ▒
         - 11.49% __x64_sys_ioctl

                              ▒
              ksys_ioctl

                              ▒
              rpc_populate.constprop.0

                              ▒
              _btrfs_ioctl_send

                              ▒
            - btrfs_ioctl_send

                              ▒
               - 12.87% process_extent

                              ▒
                  - 13.00% send_extent_data

                              ▒
                     - 4.72% send_cmd

                              ▒
                        - 4.64% kernel_write

                              ▒
                           - 4.73% vfs_write

                              ▒
                              - 4.52% new_sync_write

                              ▒
                                 - 4.83% pipe_write

                              ▒
                                    - 1.89% copy_page_from_iter

                              ▒
                                       - 3.13% _copy_from_iter

                              ▒
                                            2.93% memcpy_erms

                              ▒
                                    - 1.29% __alloc_pages_nodemask

                              ▒
                                         1.05% get_page_from_freelist

                              ▒
                                    - 0.72% schedule

                              ▒
                                         0.77% __schedule

                              ▒
                     - 2.72% __do_page_cache_readahead

                              ▒
                        - 2.07% read_pages.isra.0

                              ▒
                           - 2.05% extent_readpages

                              ▒
For a higher level overview, try: perf top --sort comm,dso

                              ▒

  reply	other threads:[~2020-05-04  8:43 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-04  7:43 5.6, slow send/receive, < 1MB/s Chris Murphy
2020-05-04  7:47 ` Nikolay Borisov
2020-05-04  8:03 ` Chris Murphy
2020-05-04  8:12   ` Chris Murphy
2020-05-04  8:13   ` Nikolay Borisov
2020-05-04  8:25     ` Chris Murphy
2020-05-04  8:43       ` Chris Murphy [this message]
2020-05-06  5:48         ` Chris Murphy
2020-05-06 21:04           ` Chris Murphy
2020-05-06 21:07             ` Chris Murphy
2020-05-23 16:11               ` Jorge Bastos
2020-05-23 16:42                 ` A L
2020-06-06 16:16                   ` Jorge Bastos
2020-06-06 16:24                     ` Jorge Bastos

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