First, we have the latest 12th Gen Alder Lake-S Core i9-12900K and the processor loses up to 26.7% performance when measuring the Sockperf throughput. Other than this, the i9-12900K loses anywhere between 2 to 14.5% with the Spectre-BHB patch.
An 11th Gen Tiger Lake Core i7-1185G7 processor was also tested and this time the maximum loss is even greater as an unpatched system performed up to 35.6% better. In another test, the unpatched system was 34.1% faster. Overall, other than these two tests, the unpatched system lost anywhere between 2% to 26.1% performance.
影響は甚大 (スコア:5, 参考になる)
Branch History Injection (BHI) exploit leaking root entry in /etc/shadow
https://youtu.be/537HUwV36ME [youtu.be]
10分程度で /etc/shadow が読み出せるのはインパクトがあります(動画は一部 20倍速なので 1分で見れます)。
Linux はパッチがでているといっても、ようするに機能の封印なのでしょうか、パフォーマンスへの影響は甚大なようです。Intel 12世代 Alder Lake で最大 26.7%、11世代 Tiger Lake で最大 35.6% ダウンという記載がありました。
Even modern Intel CPUs are losing up to 36% performance with the new Spectre BHI patch
https://www.neowin.net/news/even-modern-intel-cpus-are-losing-up-to-36... [neowin.net]
First, we have the latest 12th Gen Alder Lake-S Core i9-12900K and the processor loses up to 26.7% performance when measuring the Sockperf throughput. Other than this, the i9-12900K loses anywhere between 2 to 14.5% with the Spectre-BHB patch.
An 11th Gen Tiger Lake Core i7-1185G7 processor was also tested and this time the maximum loss is even greater as an unpatched system performed up to 35.6% better. In another test, the unpatched system was 34.1% faster. Overall, other than these two tests, the unpatched system lost anywhere between 2% to 26.1% performance.
なお、AMDも該
Re:影響は甚大 (スコア:1)
「AMDも該当する」はちょっと表現がおかしくて、いくつかの緩和機能があるうちのひとつが機能しないことが分かったので、既にある別の緩和策に切り替えてね、って感じです。