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Message-ID: <709767.60054.qm@web52311.mail.re2.yahoo.com>
Date: Mon, 11 Jun 2007 12:05:02 -0700 (PDT)
From: Philip Romanov <philip_romanov@...oo.com>
To: Stephen Hemminger <shemminger@...ux-foundation.org>
Cc: netdev@...r.kernel.org
Subject: Re: SKY2 vs SK98LIN performance on 88E8053 MAC
> > We are doing pure IPv4 forwarding between two
> Ethernet
> > interfaces:
> >
> > IXIA port A<--->System Under Test<--->IXIA Port B
> >
> > Traffic has two IP destinations for each direction
> and
> > L4 protocol is UDP. There are two static ARP
> entries
> > and only interface routes. Two tests are identical
> > except that we switch from one driver to another.
> >
> > Ethernet ports on the SUT are oversubscribed --
> I'm
> > sending 60% of line rate (of 256-byte packets) and
> > measuring percentage of pass-through traffic which
> > makes to the IXIA port on the other side. Traffic
> is
> > bidirectional and system load is close to 100%.
> >
>
> Could you post the profiles. Hopefully, others have
> good ideas
> as well.
>
> 256 bytes is the size where the copybreak
> optimization kicks in
> so you might want to experiment with the copybreak
> module option
> to the sky2 driver. copybreak=0 would no packets to
> be copied,
> copybreak=1514 would cause all packets to be copied.
> Copying is
> an optimization that helps when receiving small
> packets locally,
> but may slow down forwarding path.
>
Profiles were attached to previous posting in the
thread. I'm pasting them in plain text now at the end.
There are four profiles: two for the vmlinux and two
for sky2 and sk98lin drivers.
Regarding copybreak parameter: it appears that it
kicks in starting from 128 bytes by default???
...
static int copybreak __read_mostly = 128;
module_param(copybreak, int, 0);
MODULE_PARM_DESC(copybreak, "Receive copy threshold");
...
Anyway, I tried both copybreak settings of 0 and 1500:
there is significant slowdown when copybreak is set to
1500 with 256-byte traffic. Another clarification:
256-byte packets refer to entire Ethernet frame
including FCS, so when packets make into the driver
they become 252-byte long. I also tried to switch
driver to IRQ mode from MSI (SK98LIN is running is IRQ
mode) -- that did not have any significant effect on
forwarding performance.
Oprofile results:
================================================
profile for vmlinux 2.6.21.3 running with sk98lin
driver:
CPU: PIII, speed 2000.1 MHz (estimated)
Counted CPU_CLK_UNHALTED events (clocks processor is
not halted) with a unit mask of 0x00 (No unit mask)
count 100000
samples % symbol name
1626 14.3222 _raw_spin_trylock
935 8.2357 dev_hard_start_xmit
756 6.6590 sub_preempt_count
574 5.0559 __alloc_skb
507 4.4658 _raw_spin_unlock
462 4.0694 add_preempt_count
452 3.9813 dev_queue_xmit
432 3.8052 ip_output
416 3.6642 ip_rcv
406 3.5761 preempt_schedule
380 3.3471 netif_receive_skb
364 3.2062 __qdisc_run
283 2.4927 skb_release_data
274 2.4135 debug_smp_processor_id
265 2.3342 kfree
219 1.9290 kmem_cache_free
211 1.8585 __kmalloc
181 1.5943 ip_route_input
177 1.5591 pfifo_fast_dequeue
164 1.4446 ip_forward
150 1.3212 kmem_cache_alloc
141 1.2420 __kfree_skb
128 1.1275 ide_insw
121 1.0658 rt_hash_code
100 0.8808 pfifo_fast_requeue
96 0.8456 nf_iterate
94 0.8280 pfifo_fast_enqueue
91 0.8016 eth_type_trans
80 0.7047 nf_hook_slow
78 0.6870 cache_alloc_refill
72 0.6342 dev_kfree_skb_any
68 0.5990 local_bh_enable
58 0.5109 kfree_skb
58 0.5109 kfree_skbmem
52 0.4580 free_block
49 0.4316 selinux_ipv4_postroute_last
48 0.4228 delay_tsc
38 0.3347 page_fault
36 0.3171 kunmap_atomic
33 0.2907 memcpy
27 0.2378 __handle_mm_fault
27 0.2378 __netif_schedule
27 0.2378 cache_flusharray
26 0.2290 do_wp_page
25 0.2202 net_rx_action
21 0.1850 __d_lookup
16 0.1409 __copy_to_user_ll
16 0.1409 unmap_vmas
15 0.1321 default_idle
15 0.1321 kmap_atomic
14 0.1233 get_page_from_freelist
12 0.1057 __link_path_walk
12 0.1057 flush_tlb_mm
12 0.1057 strnlen_user
11 0.0969 avc_has_perm_noaudit
11 0.0969 do_page_fault
11 0.0969 sysenter_past_esp
10 0.0881 inode_has_perm
10 0.0881 net_tx_action
10 0.0881 selinux_inode_permission
9 0.0793 __might_sleep
9 0.0793 filemap_nopage
8 0.0705 cache_reap
8 0.0705 find_get_page
8 0.0705 find_vma
8 0.0705 local_bh_disable
7 0.0617 _atomic_dec_and_lock
6 0.0528 __copy_from_user_ll
6 0.0528 do_lookup
6 0.0528 do_timer
6 0.0528 free_hot_cold_page
6 0.0528 hrtimer_run_queues
6 0.0528 run_rebalance_domains
5 0.0440 apic_timer_interrupt
5 0.0440 error_code
5 0.0440 find_busiest_group
5 0.0440 task_rq_lock
4 0.0352 __do_softirq
4 0.0352 _spin_lock_irq
4 0.0352 copy_page_range
4 0.0352 do_mmap_pgoff
4 0.0352 do_softirq
4 0.0352 irq_entries_start
4 0.0352 put_page
4 0.0352 radix_tree_lookup
4 0.0352 raise_softirq
4 0.0352 restore_nocheck
4 0.0352 sched_clock
4 0.0352 schedule
3 0.0264 __pagevec_lru_add_active
3 0.0264 account_system_time
3 0.0264 apm_bios_call_simple
3 0.0264 avc_audit
3 0.0264 avc_has_perm
3 0.0264 do_IRQ
3 0.0264 drain_array
3 0.0264 getname
3 0.0264 handle_IRQ_event
3 0.0264 handle_fasteoi_irq
3 0.0264 mutex_lock
3 0.0264 page_remove_rmap
3 0.0264 prio_tree_insert
3 0.0264 run_timer_softirq
3 0.0264 serial_in
3 0.0264 set_cpus_allowed
3 0.0264 shrink_dcache_sb
3 0.0264 strncpy_from_user
2 0.0176 __wake_up_bit
2 0.0176 _raw_read_trylock
2 0.0176 _raw_read_unlock
2 0.0176 alloc_inode
2 0.0176 apm_cpu_idle
2 0.0176 clocksource_get_next
2 0.0176 common_interrupt
2 0.0176 copy_process
2 0.0176 do_sigaction
2 0.0176 dup_fd
2 0.0176 file_move
2 0.0176 flush_tlb_page
2 0.0176 free_pages_bulk
2 0.0176 mark_page_accessed
2 0.0176 mntput_no_expire
2 0.0176 raise_softirq_irqoff
2 0.0176 resume_userspace
2 0.0176 ret_from_intr
2 0.0176 serial_out
2 0.0176 softlockup_tick
2 0.0176 tick_handle_periodic
2 0.0176 unlink_file_vma
2 0.0176 up_read
2 0.0176 vfs_read
2 0.0176 vm_normal_page
1 0.0088 __add_entropy_words
1 0.0088 __alloc_pages
1 0.0088 __const_udelay
1 0.0088 __first_cpu
1 0.0088 __follow_mount
1 0.0088 __lookup_hash
1 0.0088 __mod_zone_page_state
1 0.0088 __next_cpu
1 0.0088 __pte_alloc
1 0.0088 __remove_shared_vm_struct
1 0.0088 __rmqueue
1 0.0088 __wake_up
1 0.0088 __wake_up_common
1 0.0088 ack_ioapic_quirk_irq
1 0.0088 anon_vma_link
1 0.0088 anon_vma_unlink
1 0.0088 arch_get_unmapped_area_topdown
1 0.0088 can_share_swap_page
1 0.0088 cfq_exit_cfqq
1 0.0088 cfq_queue_empty
1 0.0088 copy_mount_options
1 0.0088 copy_strings
1 0.0088 create_write_pipe
1 0.0088 current_kernel_time
1 0.0088 current_tick_length
1 0.0088 d_lookup
1 0.0088 do_filp_open
1 0.0088 do_munmap
1 0.0088 do_notify_parent
1 0.0088 do_notify_resume
1 0.0088 do_path_lookup
1 0.0088 down_read_trylock
1 0.0088 exec_keys
1 0.0088 find_vma_prev
1 0.0088 free_page_and_swap_cache
1 0.0088 free_pgd_range
1 0.0088 generic_file_aio_read
1 0.0088 get_task_mm
1 0.0088 get_unmapped_area
1 0.0088 get_write_access
1 0.0088 hrtimer_cancel
1 0.0088 ide_inb
1 0.0088 ide_outb
1 0.0088 inode_init_once
1 0.0088 internal_add_timer
1 0.0088 irq_enter
1 0.0088 kmem_cache_zalloc
1 0.0088 kprobe_flush_task
1 0.0088 lookup_mnt
1 0.0088 may_create
1 0.0088 memmove
1 0.0088 new_inode
1 0.0088 notifier_call_chain
1 0.0088 number
1 0.0088 open_namei
1 0.0088 pid_task
1 0.0088 pipe_write_fasync
1 0.0088 proc_delete_inode
1 0.0088 proc_flush_task
1 0.0088 proc_lookup
1 0.0088 profile_tick
1 0.0088 put_files_struct
1 0.0088 rb_insert_color
1 0.0088 rcu_process_callbacks
1 0.0088 recalc_task_prio
1 0.0088 resched_task
1 0.0088 resume_kernel
1 0.0088 selinux_bprm_alloc_security
1 0.0088 selinux_bprm_set_security
1 0.0088 selinux_file_permission
1 0.0088 selinux_inode_getattr
1 0.0088 shmem_get_inode
1 0.0088 shmem_mknod
1 0.0088 sigprocmask
1 0.0088 slab_destroy
1 0.0088 sock_attach_fd
1 0.0088 sync_dquots
1 0.0088 sys_mmap2
1 0.0088 sys_munmap
1 0.0088 sys_rt_sigprocmask
1 0.0088 tick_periodic
1 0.0088 vfs_create
1 0.0088 vma_merge
1 0.0088 write_chan
1 0.0088 zone_watermark_ok
==================================================
profile for vmlinux 2.6.21.3 running with sky2 driver:
CPU: PIII, speed 2000.22 MHz (estimated)
Counted CPU_CLK_UNHALTED events (clocks processor is
not halted) with a unit mask of 0x00 (No unit mask)
count 100000
samples % symbol name
7894 9.0213 __alloc_skb
6475 7.3997 skb_release_data
5706 6.5208 dev_hard_start_xmit
5656 6.4637 ip_output
5652 6.4591 eth_type_trans
5432 6.2077 ip_rcv
5278 6.0317 netif_receive_skb
3499 3.9987 kfree
3195 3.6513 _raw_spin_trylock
3003 3.4318 kmem_cache_free
2675 3.0570 debug_smp_processor_id
2669 3.0501 __kmalloc
2383 2.7233 sub_preempt_count
2348 2.6833 ip_route_input
2263 2.5862 ip_forward
2185 2.4970 add_preempt_count
2105 2.4056 dev_queue_xmit
1994 2.2788 kmem_cache_alloc
1587 1.8136 __kfree_skb
1479 1.6902 rt_hash_code
1409 1.6102 nf_iterate
1300 1.4856 pfifo_fast_enqueue
1262 1.4422 preempt_schedule
1084 1.2388 nf_hook_slow
986 1.1268 _raw_spin_unlock
939 1.0731 kfree_skb
935 1.0685 kfree_skbmem
926 1.0582 __qdisc_run
897 1.0251 local_bh_enable
792 0.9051 pfifo_fast_dequeue
503 0.5748 __netdev_alloc_skb
451 0.5154 selinux_ipv4_postroute_last
411 0.4697 dev_kfree_skb_any
298 0.3406 __copy_to_user_ll
269 0.3074 cache_alloc_refill
263 0.3006 free_block
174 0.1988 local_bh_disable
122 0.1394 cache_flusharray
82 0.0937 net_rx_action
75 0.0857 delay_tsc
65 0.0743 memcpy
48 0.0549 net_tx_action
41 0.0469 kunmap_atomic
39 0.0446 do_wp_page
28 0.0320 __link_path_walk
27 0.0309 __d_lookup
27 0.0309 page_fault
22 0.0251 __do_softirq
22 0.0251 get_page_from_freelist
20 0.0229 kmap_atomic
19 0.0217 __handle_mm_fault
15 0.0171 __netif_schedule
14 0.0160 avc_has_perm_noaudit
14 0.0160 find_vma
13 0.0149 hrtimer_run_queues
11 0.0126 flush_tlb_mm
10 0.0114 schedule
9 0.0103 inode_has_perm
8 0.0091 do_timer
8 0.0091 strnlen_user
7 0.0080 avc_has_perm
7 0.0080 do_page_fault
7 0.0080 run_timer_softirq
6 0.0069 __might_sleep
6 0.0069 apic_timer_interrupt
6 0.0069 default_idle
6 0.0069 filemap_nopage
6 0.0069 find_busiest_group
6 0.0069 find_get_page
6 0.0069 mod_zone_page_state
6 0.0069 profile_tick
6 0.0069 sched_clock
5 0.0057 __rmqueue
5 0.0057 _spin_lock_irq
5 0.0057 apm_bios_call_simple
5 0.0057 error_code
5 0.0057 raise_softirq_irqoff
5 0.0057 serial_out
5 0.0057 set_cpus_allowed
5 0.0057 softlockup_tick
5 0.0057 tick_periodic
5 0.0057 unmap_vmas
4 0.0046 __rcu_process_callbacks
4 0.0046 _atomic_dec_and_lock
4 0.0046 account_system_time
4 0.0046 cache_reap
4 0.0046 copy_process
4 0.0046 do_mmap_pgoff
4 0.0046 kmem_cache_zalloc
4 0.0046 memmove
4 0.0046 read_tsc
4 0.0046 scheduler_tick
4 0.0046 shrink_dcache_sb
4 0.0046 smp_apic_timer_interrupt
4 0.0046 strncpy_from_user
3 0.0034 _raw_read_unlock
3 0.0034 avc_audit
3 0.0034 clocksource_get_next
3 0.0034 dput
3 0.0034 file_has_perm
3 0.0034 inode_doinit_with_dentry
3 0.0034 inode_init_once
3 0.0034 put_page
3 0.0034 raise_softirq
3 0.0034 rb_insert_color
3 0.0034 restore_nocheck
3 0.0034 ret_from_intr
3 0.0034 run_posix_cpu_timers
3 0.0034 selinux_inode_permission
3 0.0034 serial_in
3 0.0034 vm_normal_page
2 0.0023 __follow_mount
2 0.0023 __mod_zone_page_state
2 0.0023 __switch_to
2 0.0023 __wake_up_bit
2 0.0023 anon_vma_prepare
2 0.0023 anon_vma_unlink
2 0.0023 atomic_notifier_call_chain
2 0.0023 copy_page_range
2 0.0023 drain_array
2 0.0023 dummy_file_mmap
2 0.0023 find_vma_prepare
2 0.0023 free_hot_cold_page
2 0.0023 irq_entries_start
2 0.0023 irq_exit
2 0.0023 msecs_to_jiffies
2 0.0023 neigh_lookup
2 0.0023 page_add_file_rmap
2 0.0023 radix_tree_lookup
2 0.0023 resume_userspace
2 0.0023 selinux_vm_enough_memory
2 0.0023 shmem_get_inode
1 0.0011 __alloc_pages
1 0.0011 __copy_from_user_ll
1 0.0011 __copy_user_intel
1 0.0011 __dec_zone_page_state
1 0.0011 __dentry_open
1 0.0011 __free_pages_ok
1 0.0011 __mutex_init
1 0.0011 __netif_rx_schedule
1 0.0011 __next_cpu
1 0.0011 __pagevec_lru_add_active
1 0.0011 __rcu_pending
1 0.0011 __wake_up_common
1 0.0011 _raw_read_trylock
1 0.0011 _read_lock_irq
1 0.0011 acpi_pm_read
1 0.0011 add_to_page_cache
1 0.0011 add_wait_queue
1 0.0011 alloc_pid
1 0.0011 anon_vma_link
1 0.0011 apm_bios_call
1 0.0011 apm_cpu_idle
1 0.0011 arch_get_unmapped_area_topdown
1 0.0011 blockable_page_cache_readahead
1 0.0011 cap_bprm_set_security
1 0.0011 cap_capable
1 0.0011 cdev_get
1 0.0011 clear_user
1 0.0011 copy_from_user
1 0.0011 copy_strings
1 0.0011 copy_to_user
1 0.0011 cp_new_stat64
1 0.0011 cpuset_exit
1 0.0011 current_tick_length
1 0.0011 d_alloc
1 0.0011 deny_write_access
1 0.0011 dequeue_task
1 0.0011 do_exit
1 0.0011 do_lookup
1 0.0011 do_path_lookup
1 0.0011 do_sigaction
1 0.0011 do_softirq
1 0.0011 do_wait
1 0.0011 dummy_inode_setattr
1 0.0011 dup_fd
1 0.0011 exit_itimers
1 0.0011 exit_mm
1 0.0011 ext3_follow_link
1 0.0011 ext3_release_file
1 0.0011 fib_semantic_match
1 0.0011 file_read_actor
1 0.0011 filp_close
1 0.0011 find_inode_fast
1 0.0011 find_next_bit
1 0.0011 find_pid
1 0.0011 find_vma_prev
1 0.0011 flush_thread
1 0.0011 flush_tlb_page
1 0.0011 fn_hash_lookup
1 0.0011 free_page_and_swap_cache
1 0.0011 free_pages
1 0.0011 half_md4_transform
1 0.0011 handle_edge_irq
1 0.0011 hrtimer_init
1 0.0011 hweight32
1 0.0011 idle_cpu
1 0.0011 insert_vm_struct
1 0.0011 iput
1 0.0011 irq_enter
1 0.0011 ksoftirqd
1 0.0011 lookup_create
1 0.0011 lookup_mnt
1 0.0011 lru_cache_add_active
1 0.0011 move_native_irq
1 0.0011 mutex_unlock
1 0.0011 open_exec
1 0.0011 page_remove_rmap
1 0.0011 permission
1 0.0011 pipe_poll
1 0.0011 pipe_read
1 0.0011 prepare_to_wait
1 0.0011 proc_lookup
1 0.0011 radix_tree_preload
1 0.0011 rb_erase
1 0.0011 read_chan
1 0.0011 release_pages
1 0.0011 remove_vma
1 0.0011 restore_sigcontext
1 0.0011 run_rebalance_domains
1 0.0011 rw_verify_area
1 0.0011 save_i387
1 0.0011 second_overflow
1 0.0011 security_compute_sid
1 0.0011 selinux_file_mmap
1 0.0011 selinux_sysctl
1 0.0011 send_signal
1 0.0011 seq_escape
1 0.0011 shmem_swp_alloc
1 0.0011 shmem_truncate
1 0.0011 show_vfsmnt
1 0.0011 sig_ignored
1 0.0011 slab_destroy
1 0.0011 snprintf
1 0.0011 sys_access
1 0.0011 sys_clone
1 0.0011 sys_close
1 0.0011 sys_faccessat
1 0.0011 sys_fcntl64
1 0.0011 sys_mkdirat
1 0.0011 sys_mprotect
1 0.0011 sys_rt_sigaction
1 0.0011 sysenter_past_esp
1 0.0011 task_rq_lock
1 0.0011 task_running_tick
1 0.0011 unix_stream_connect
1 0.0011 unlink_file_vma
1 0.0011 up_read
1 0.0011 vma_adjust
1 0.0011 vma_link
1 0.0011 vma_prio_tree_add
1 0.0011 worker_thread
1 0.0011 zone_watermark_ok
====================================================
profile for SK98LIN driver:
CPU: PIII, speed 2000.1 MHz (estimated)
Counted CPU_CLK_UNHALTED events (clocks processor is
not halted) with a unit mask of 0x00 (No unit mask)
count 100000
samples % image name symbol name
2357 43.3910 sk98lin.ko SkY2Poll
870 16.0162 sk98lin.ko
GiveTxBufferToHw
811 14.9300 sk98lin.ko SkY2Xmit
677 12.4632 sk98lin.ko
FillReceiveTableYukon2
206 3.7923 sk98lin.ko SkGmPhyRead
113 2.0803 sk98lin.ko SkY2Isr
103 1.8962 sk98lin.ko
SkCsGetReceiveInfo
80 1.4728 sk98lin.ko SkMacIrq
70 1.2887 sk98lin.ko
SkGmPhyWrite
53 0.9757 sk98lin.ko
SkGmMacStatistic
30 0.5523 sk98lin.ko
SkGmResetCounter
25 0.4602 sk98lin.ko
CheckRXCounters
8 0.1473 sk98lin.ko
SkY2FreeRxBuffers
5 0.0920 sk98lin.ko SkHwtRead
4 0.0736 sk98lin.ko SkGmInitMac
2 0.0368 sk98lin.ko
SkEventDispatcher
2 0.0368 sk98lin.ko
SkMacHashing
2 0.0368 sk98lin.ko
SkMacRxTxDisable
2 0.0368 sk98lin.ko
SkMacSoftRst
2 0.0368 sk98lin.ko
SkYuk2SirqIsr
1 0.0184 sk98lin.ko
DoInitRamQueue
1 0.0184 sk98lin.ko
SkAddrGmacMcUpdate
1 0.0184 sk98lin.ko SkDrvEvent
1 0.0184 sk98lin.ko
SkGeCheckTimer
1 0.0184 sk98lin.ko
SkGeInitMacFifo
1 0.0184 sk98lin.ko
SkGeStopPort
1 0.0184 sk98lin.ko SkTimerStop
1 0.0184 sk98lin.ko
SkY2PortStop
1 0.0184 sk98lin.ko
SkYuk2PortSirq
1 0.0184 sk98lin.ko timer_done
=============================================
SKY2 profile:
CPU: PIII, speed 2000.22 MHz (estimated)
Counted CPU_CLK_UNHALTED events (clocks processor is
not halted) with a unit mask of 0x00 (No unit mask)
count 100000
samples % image name symbol name
69576 64.4634 sky2.ko
sky2_xmit_frame
27759 25.7192 sky2.ko sky2_poll
5782 5.3571 sky2.ko
sky2_rx_unmap_skb
1310 1.2137 sky2.ko
sky2_tx_complete
1276 1.1822 sky2.ko sky2_rx_add
1018 0.9432 sky2.ko
sky2_rx_submit
687 0.6365 sky2.ko
sky2_rx_map_skb
521 0.4827 sky2.ko .text
2 0.0019 sky2.ko sky2_intr
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