PCを利用したネットワーク品質測定は良く利用されるが，その測定誤差は最近の高性能NW環境に置いては無視できない 領域にある.遅延指標に影響の大きいパケットのタイムスタンプ付与精度は汎用PC・OSにおいては保証困難であり，さら にITU-T Y.1540勧告の遅延揺らぎ指標のようにパケット転送遅延値の99.9%値のように異常値に近い億の測定が求め られる.そこで，PCでのパケット測定について，特に時刻関連の精度に着日して評価実験を行うた結果について報告す る.%Network performance evaluation by commodity PCs are quite often used, but the measurement error of those evaluation is generally not negligible compared to the recent high-performance networks. Timestamp accuracy of measurement equipment, which has an effect on delay related metrics, are usually not guaranteed. Especially, delay variation metric as of ITU-T Y.1540 requires 99.9 percentile of packet transfer delay. This means unusual value's measurement reliability is required in delay variation measurement. This report provides time-related accuracy evaluation of network performance measurement using PCs.
展开▼
