maxinum of memory can i allocate for fast read of 2GByate/s
in [Device Drivers]
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From: pascal on 18 Aug 2010 06:38 i have question and looking for help. the situation: the appliction needs to read from the driver/Board (PCIe) data rate of about ~2GByte/s to the pc first save it to memory then to buffer it to loacal drive for later process. question: who will allocate the memory the appliction from the user mode and pass it to the driver? can the driver allocate that memory from the kernel? (OS x64) what can of design patten should i used for example? any advice?
From: Maxim S. Shatskih on 18 Aug 2010 08:42 > question: who will allocate the memory the appliction from the user mode and > pass it to the driver? Better to do this, so that there will be no extra memcpy(). -- Maxim S. Shatskih Windows DDK MVP maxim(a)storagecraft.com http://www.storagecraft.com
From: Tim Roberts on 19 Aug 2010 01:30 pascal <pascal(a)discussions.microsoft.com> wrote: > >i have question and looking for help. > >the situation: the appliction needs to read from the driver/Board (PCIe) >data rate of about ~2GByte/s to the pc first save it to memory then to buffer >it to loacal drive for later process. For how long? Hot drives can save about 40MB/s, so you will need to store it all in memory. -- Tim Roberts, timr(a)probo.com Providenza & Boekelheide, Inc.
From: pascal on 19 Aug 2010 05:40 if i need to store in all data in memory for example 6 GByte all in memory (64bit OS), the question is what memory? Virtual /physical VirtualAlloc can reserve 6 GByte in the Virtual memory page file but will that will be too slow? i mean that windows memory manger may could not stand up to the rate of data needed to writen to the page file. or use physical memory, what is the best way/practice ? Thanks "Tim Roberts" wrote: > pascal <pascal(a)discussions.microsoft.com> wrote: > > > >i have question and looking for help. > > > >the situation: the appliction needs to read from the driver/Board (PCIe) > >data rate of about ~2GByte/s to the pc first save it to memory then to buffer > >it to loacal drive for later process. > > For how long? Hot drives can save about 40MB/s, so you will need to store > it all in memory. > -- > Tim Roberts, timr(a)probo.com > Providenza & Boekelheide, Inc. > . >
From: Maxim S. Shatskih on 19 Aug 2010 07:12
> For how long? Hot drives can save about 40MB/s More. 80 is real, but... after ~30 sec of such writing, some drives do the internal recalibration, which means that all next writes are stopped for 10s or such. -- Maxim S. Shatskih Windows DDK MVP maxim(a)storagecraft.com http://www.storagecraft.com |