linux-kernel - Re: [GIT pull] x86/pti: The real thing

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Date:   Sun, 31 Dec 2017 09:40:46 +0100
From:   François Valenduc <francoisvalenduc@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [GIT pull] x86/pti: The real thing

Le 30/12/17 à 10:04, Mike Galbraith a écrit :
> On Fri, 2017-12-29 at 17:42 -0800, Linus Torvalds wrote:
>> On Thu, Dec 28, 2017 at 12:34 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
>>>
>>> please pull the latest x86-pti-for-linus git tree from:
>>>
>>>    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-pti-for-linus
>>>
>>> This is the final set of enabling page table isolation on x86:
>>
>> Ok, after that late MCORE2 scare that held things up, this is now
>> merged in my tree and pushed out. "WorksForMe(tm)".
> 
> But it definitely ain't free.  NFS hanging out in the kernel for 82ms
> at a whack may not be such a bad idea after all ;-)
> 
> i4790+tbench
> 
> CONFIG_PAGE_TABLE_ISOLATION=y
> Throughput 3467.72 MB/sec  8 clients  8 procs  max_latency=3.499 ms
> 
> CONFIG_PAGE_TABLE_ISOLATION=n
> Throughput 3700.81 MB/sec  8 clients  8 procs  max_latency=4.893 ms
> 
> CONFIG_PAGE_TABLE_ISOLATION=y                CONFIG_PAGE_TABLE_ISOLATION=n
> 4.48%  [k] syscall_return_via_sysret         3.56%  [k] copy_user_enhanced_fast_string
> 3.41%  [k] copy_user_enhanced_fast_string    2.54%  [.] child_run
> 2.48%  [.] child_run                         1.76%  [k] tcp_transmit_skb
> 1.64%  [.] __strchr_sse2                     1.74%  [k] tcp_recvmsg
> 1.60%  [k] tcp_transmit_skb                  1.69%  [.] __strchr_sse2
> 1.55%  [k] tcp_recvmsg                       1.56%  [.] __GI_____strtoll_l_internal
> 1.46%  [k] ipt_do_table                      1.44%  [k] ipt_do_table
> 1.45%  [.] __GI_____strtoll_l_internal       1.42%  [k] tcp_sendmsg_locked
> 1.25%  [k] tcp_in_window                     1.34%  [k] tcp_write_xmit
> 1.21%  [.] next_token                        1.34%  [k] tcp_clean_rtx_queue
> 1.17%  [k] tcp_clean_rtx_queue               1.26%  [.] next_token
> 1.16%  [k] tcp_sendmsg_locked                1.24%  [k] tcp_in_window
> 1.15%  [k] __switch_to                       1.19%  [k] nf_conntrack_in
> 1.10%  [k] switch_mm_irqs_off                1.17%  [k] __switch_to
> 1.09%  [k] tcp_write_xmit                    1.13%  [.] __strcasecmp_l_avx
> 1.09%  [k] tcp_ack                           1.10%  [k] switch_mm_irqs_off
> 1.08%  [k] nf_hook_slow                      1.08%  [k] tcp_v4_rcv
> 1.04%  [k] __sched_text_start                1.06%  [k] nf_hook_slow
> 0.99%  [.] __strcasecmp_l_avx                1.05%  [k] tcp_ack
> 

The KConfig text refers to Documentation/x86/pagetable-isolation.txt,
which doesn't exists...

François Valenduc