DP: Dynamic Prepage in Postcopy Migration for Fixed-Size Data Load
نویسندگان
چکیده
Postcopy migration is a mature technology in virtualization. However the performance of postcopy is not stable. We find many memory intensive loads having a high proportion of independent fixed-size data (FSD) cases. To improve migration performance, we present DP: an algorithm which applies to intelligently tackle FSD load during postcopy migration. We implement DP as an online algorithm triggered by remote paging, and adjusting to prepage the most appropriate amount of pages related to recent page fault records. DP also has a threshold processing mechanism to prevent from noise which is derived from load size fluctuation. The experimental results show that DP algorithm can significantly reduce response time and implicit downtime in postcopy migration, with an high improvement on QoS. 1 Postcopy Migration Postcopy migration[1,2] is one of the common methods in VM live migration. It forces to move the running VM to target side, then fetches pages from source side when page fault occurs, and pushes the remaining pages to target side at the same time. In this paper we target to improve migration performance by reducing the response time for each page fault in postcopy migration, using a prepage method. Response time is bottleneck for migration. It is the time waiting for fetching pages from source side when page fault occurs. A proper prepage method can fetch a proper amount of pages in advance, and reduce the response time for each case.
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تاریخ انتشار 2014