Date: Tue, 31 Jan 2012 09:23:50 +0800 From: Paul Ambrose <ambrosehua@gmail.com> To: Kostik Belousov <kostikbel@gmail.com> Cc: freebsd-current <freebsd-current@freebsd.org> Subject: Re: Does anyone try kib's Sandy Bridge PCID patch (pcid.2.patch)? Message-ID: <CAMwoQQ7Obe%2BmFBYiSqZ66NV1j6MaLCjkHA5hjHAV%2BPah4Mg3ZQ@mail.gmail.com> In-Reply-To: <20120130164316.GW2726@deviant.kiev.zoral.com.ua> References: <CAMwoQQ4onrPWO1FBuDtW6nPsoaxNPP4wevv0DEJ4CorzEKb5JA@mail.gmail.com> <20120130063607.GV2726@deviant.kiev.zoral.com.ua> <CAMwoQQ4fP%2BV5VngOGLUDG5D9Di2Y5HBHSBzGq%2BODGkEsaAffpg@mail.gmail.com> <20120130164316.GW2726@deviant.kiev.zoral.com.ua>
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--f46d0442681acb61dc04b7c8d014 Content-Type: text/plain; charset=GB2312 Content-Transfer-Encoding: quoted-printable =D4=DA 2012=C4=EA1=D4=C231=C8=D5 =C9=CF=CE=E712:43=A3=ACKostik Belousov <ko= stikbel@gmail.com> =D0=B4=B5=C0=A3=BA > On Mon, Jan 30, 2012 at 07:08:13PM +0800, Paul Ambrose wrote: >> ?? 2012??1??30?? ????2:36??Kostik Belousov <kostikbel@gmail.com> ?????? >> > On Mon, Jan 30, 2012 at 10:15:51AM +0800, Paul Ambrose wrote: >> >> I have two boxes, one is AMD Athlon 610e 2.4G with FreeBSD-current >> >> patched with pcid.2.patch? It works well without other issue and it >> >> seem the pcid patch >> >> does not affect other part of the kernel. The other one is Sandy >> > Athlons do not have PCID and probably will never implement it. They us= e >> > other tricks to get similar optimizations, transparently to the OS. >> > >> Just curious, is this AMD similar optimizations >> Address Space Number (ASN) and Global flag >> US Patent 6,604,187. >> http://www.chip-architect.com/news/2003_09_21_Detailed_Architecture_of_A= MDs_64bit_Core.html > This and the same-important next item 'The TLB Flush Filter' is what > I referred to. > >> I did not found anything about ASN in the AMD manual > It is a transparent optimization, which does not require any OS support. > Intel PCID is completely different, it shall be explicitely handled by OS= . > It is some consequence of the nested pages support, AFAIU. > >> >> >> Bridge i5-2300 with FreeBSD 9 release patched with pcid.1.patch( the >> >> pcid.2.patch seems >> >> dependent on AVX and XSAVE stuffs which is available on -current). Bu= t >> >> it hangs up just in a few minutes. I doubt the nvidia-driver which is >> >> not recompiled with >> >> patched kernel is the root, I will check this out later, but does >> >> anyone meet similar problem? >> > There are two many variations compared to the config I did tested. >> > I do not see anything obvious in the changes between HEAD and stable/9 >> > which could be blamed. Nvidia driver might be bigger suspect, but agai= n, >> > I am not aware of anything wrong with it. >> > >> >> >> >> I have two question about the pcid.2.patch >> > >> > Item 2 is clean, I fixed it. >> > >> > For the item 1, I was only able to decipher the proposal to optimize >> > the global shootdown handler to restore the %cr3 with bit 64 set to no= t >> > invalidate current PCID. Is there some more changes ? >> > >> yes, that is what I meant. I was wondering using another way that each >> process has different >> pcid in each active processor, just as the freebsd mips and powerpc >> uses. But obviously this way >> is more friendly to non-pcid x86 processor. > Each vmspace (or pmap) has unique PCID with the patch, at least until > PCID space (12bit) is not exhausted. To really exhaust it, you need 4095 > processes, so it is unlikely but possible event with the current settings= . > Thank you for your explanation. I just disabled nvidia-driver( not load it) , and use "buildworld buildkernel" to test the pcid.1.patch with 9-release, it seems the box reset before completing the buildkernel, the attachment is my kernel config, would you mind try it on 9-release with pcid.1.patch? I will git 10-current a try to see if there is something wrong with my hardware --f46d0442681acb61dc04b7c8d014 Content-Type: application/octet-stream; name=MYKERNEL Content-Disposition: attachment; filename=MYKERNEL Content-Transfer-Encoding: base64 X-Attachment-Id: f_gy28s4o21 IwojIEdFTkVSSUMgLS0gR2VuZXJpYyBrZXJuZWwgY29uZmlndXJhdGlvbiBmaWxlIGZvciBGcmVl QlNEL2FtZDY0CiMKIyBGb3IgbW9yZSBpbmZvcm1hdGlvbiBvbiB0aGlzIGZpbGUsIHBsZWFzZSBy ZWFkIHRoZSBjb25maWcoNSkgbWFudWFsIHBhZ2UsCiMgYW5kL29yIHRoZSBoYW5kYm9vayBzZWN0 aW9uIG9uIEtlcm5lbCBDb25maWd1cmF0aW9uIEZpbGVzOgojCiMgICAgaHR0cDovL3d3dy5GcmVl QlNELm9yZy9kb2MvZW5fVVMuSVNPODg1OS0xL2Jvb2tzL2hhbmRib29rL2tlcm5lbGNvbmZpZy1j b25maWcuaHRtbAojCiMgVGhlIGhhbmRib29rIGlzIGFsc28gYXZhaWxhYmxlIGxvY2FsbHkgaW4g L3Vzci9zaGFyZS9kb2MvaGFuZGJvb2sKIyBpZiB5b3UndmUgaW5zdGFsbGVkIHRoZSBkb2MgZGlz dHJpYnV0aW9uLCBvdGhlcndpc2UgYWx3YXlzIHNlZSB0aGUKIyBGcmVlQlNEIFdvcmxkIFdpZGUg V2ViIHNlcnZlciAoaHR0cDovL3d3dy5GcmVlQlNELm9yZy8pIGZvciB0aGUKIyBsYXRlc3QgaW5m 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