Date: Thu, 02 Jun 2011 17:28:04 +0200 From: Ivan Voras <ivoras@gmail.com> To: Andriy Gapon <avg@FreeBSD.org> Cc: freebsd-performance@FreeBSD.org Subject: Re: tlb shootdown Message-ID: <72d97a0b-5ad9-4405-9b0a-832ba5a872ee@email.android.com> In-Reply-To: <4DE79D2F.8050907@FreeBSD.org> References: <4DE61E6F.1010209@FreeBSD.org> <is7u3u$jhf$1@dough.gmane.org> <4DE79D2F.8050907@FreeBSD.org>
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On the second reading, if you are asking how fast a shootdown operation itself is, then yes, it will probably not help you :) -- Sent from my Android phone, please excuse my brevity. Andriy Gapon <avg@FreeBSD.org> wrote: on 02/06/2011 15:02 Ivan Voras said the following: > On 01/06/2011 13:11, Andriy Gapon wrote: >> >> Anyone knows of a benchmark/test that can measure/demonstrate difference in tlb >> shootdown performance (or its lack)? > > The "tlb" utility from lmbench may help you. Just because it's named tlb and I asked for tlb something? :) tlb - TLB size and latency benchmark ... tlb tries to determine the size, in pages, of the TLB. The largest amount of memory it will examine is len bytes. ... Once the TLB boundary is located tlb reports the TLB miss latency as the TLB latency for twice as many pages as the TLB can hold. I am not this will tell anything about TLB _shootdown_ performance of SMP systems. Perhaps I wasn't specific enough in my original question. -- Andriy Gapon
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