{"id":151408,"date":"1999-01-01T00:00:00","date_gmt":"1999-01-01T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/ide-ultra33-performance-intel-piix4e\/"},"modified":"2018-10-16T20:41:01","modified_gmt":"2018-10-17T03:41:01","slug":"ide-ultra33-performance-intel-piix4e","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/ide-ultra33-performance-intel-piix4e\/","title":{"rendered":"IDE Ultra\/33 Performance: Intel PIIX4E"},"content":{"rendered":"<div class=\"asset-content\">\n<p>The Intel 82371AB PCI-to-ISA \/ IDE Xcelerator, also known as the PIIX4E, provides a bridge from dual IDE peripheral buses to the PCI bus (which accesses main memorey via another Intel chipset). A current IDE bus can burst data at 33 MB\/s. A 32-bit 33 MHz PCI can burst data at 133 MB\/s. For IDE->PCI transfers, the PIIX4E can pretty much keep up with an IDE bus (up to 32.6 MB\/s). However,it appears that the PIIX4E is limited to 21.9 MB)s for bursting data for PCI->IDE transfers. Adding in the setup \/ cleanup DMA costs (per request), the PIIX4E can sustain up to 21.4 MB\/s for 64KB disk writes (i.e., DMA reads) and 28.5 MB\/s for 64KB disk reads (i.e., DMA writes) on a Pentium-II system running Windows 2000 Professional. In the case of disk reads, the 14% performance difference between specified and realized bandwith is largely due to DMA setup \/ cleanup activity. Between requests, a number of PIO&#8217;s (programmed I\/ O transfers, indicative of register accesses in this case&41; and processing delays reduce raw throughput to 28.5 MB\/s for 64 KB requests (29.1 MB\/s for 128KB requests). In the case of disk writes, the performance degradation is much more severe. A third of the available bandwidth is lost to delays embedded in the actual data transfer, with DMA set \/ cleanup activity claiming another 1-2% of the remaining bandwidth. Synchronized traces of PCI and IDE and IDE activity conclusively show that the PIIX4E is responsible for the data transfer delays.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Intel 82371AB PCI-to-ISA \/ IDE Xcelerator, also known as the PIIX4E, provides a bridge from dual IDE peripheral buses to the PCI bus (which accesses main memorey via another Intel chipset). A current IDE bus can burst data at 33 MB\/s. A 32-bit 33 MHz PCI can burst data at 133 MB\/s. For IDE->PCI [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"","msr_conference_name":"","msr_doi":"","msr_arxiv_id":"","msr_s2_paper_id":"","msr_mag_id":"","msr_pubmed_id":"","msr_other_authors":"Bruce 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