NDLI: Memory Controller Optimizations for Web Servers

Content Provider	ACM Digital Library
Author	Rixner, Scott
Abstract	This paper analyzes memory access scheduling and virtual channels as mechanisms to reduce the latency of main memory accesses by the CPU and peripherals in web servers. Despite the address filtering effects of the CPU's cache hierarchy, there is significant locality and bank parallelism in the DRAM access stream of a web server, which includes traffic from the operating system, application, and peripherals. However, a sequential memory controller leaves much of this locality and parallelism unexploited, as serialization and bank conflicts affect the realizable latency. Aggressive scheduling within the memory controller to exploit the available parallelism and locality can reduce the average read latency of the SDRAM. However, bank conflicts and the limited ability of the SDRAM's internal row buffers to act as a cache hinder further latency reduction. Virtual channel SDRAMovercomes these limitations by providing a set of channel buffers that can hold segments from rows of any internal SDRAM bank. This paper presents memory controller policies that can make effective use of these channel buffers to further reduce the average read latency of the SDRAM.
Starting Page	355
Ending Page	366
Page Count	12
File Format	PDF
ISBN	0769521266
ISSN	10724451
DOI	10.1109/MICRO.2004.22
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2004-12-04
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Memory Controller Optimizations for Web Servers