.. عنوان: NIC Ring Buffer & IRQ Affinity Calculator
.. slug: nic-ring-buffer-calculator
.. تاریخ: 2026-03-27 12:00:00 UTC
.. ٹیگز: linux, nic, irq, rss, کارکردگی, kernel, calculator, tool
.. زمرہ: کیلکولیٹر
.. لنک:
.. تفصیل: انٹرفیس کی رفتار، CPU کاؤنٹ، اور ٹریفک پروفائل کی بنیاد پر تجویز کردہ ایتھول رِنگ بفر سائز، RSS قطار کی گنتی، اور CPU وابستگی پننگ حکمت عملی کا حساب لگائیں۔
.. قسم: متن
<style>
.calc-container { max-width: 900px; margin: 20px auto; padding: 20px; }
.calc-header { margin-bottom: 30px; padding: 25px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); color: white; }
.calc-header h2 { margin-top: 0; color: white; font-size: 28px; margin-bottom: 10px; }
.calc-header p  { margin: 10px 0; opacity: 0.95; font-size: 15px; }
.input-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 15px; margin-top: 20px; }
.input-group { display: flex; flex-direction: column; }
.input-group label { margin-bottom: 8px; font-weight: 600; color: rgba(255,255,255,0.95); font-size: 14px; }
.input-group input, .input-group select { padding: 14px; font-size: 14px; border: 2px solid rgba(255,255,255,0.3); border-radius: 6px; background: rgba(255,255,255,0.95); transition: all 0.3s ease; box-sizing: border-box; }
.input-group input:focus, .input-group select:focus { outline: none; border-color: #4CAF50; background: white; box-shadow: 0 0 0 3px rgba(76,175,80,0.1); }
.button-container { margin-top: 20px; display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.calc-button { padding: 14px 35px; font-size: 16px; background: #4CAF50; color: white; border: none; border-radius: 6px; cursor: pointer; font-weight: bold; transition: all 0.3s ease; box-shadow: 0 2px 4px rgba(0,0,0,0.2); }
.calc-button:hover { background: #45a049; transform: translateY(-1px); box-shadow: 0 4px 8px rgba(0,0,0,0.3); }
.calc-button:active { background: #3d8b40; transform: translateY(0); }
.help-text { margin-top: 15px; font-size: 14px; color: rgba(255,255,255,0.9); background: rgba(0,0,0,0.1); padding: 10px 15px; border-radius: 4px; }
.result-section { background: white; border: 1px solid #e0e0e0; border-radius: 8px; margin-top: 20px; overflow: hidden; box-shadow: 0 2px 4px rgba(0,0,0,0.05); transition: all 0.3s ease; }
.result-section:hover { box-shadow: 0 4px 8px rgba(0,0,0,0.1); }
.section-header { background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%); color: white; padding: 15px 20px; font-size: 18px; font-weight: bold; }
.section-content { padding: 20px; background: #fafafa; }
.result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; }
.data-row { display: flex; flex-direction: column; padding: 15px; background: white; border-radius: 6px; border-left: 4px solid #4CAF50; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
.data-label { font-weight: bold; color: #555; font-size: 13px; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
.data-value { color: #4CAF50; font-family: 'Courier New', monospace; font-size: 20px; font-weight: bold; }
.data-value.small { font-size: 14px; }
.info-box { margin-top: 15px; padding: 15px; background: #e3f2fd; color: #1565c0; border-radius: 8px; border-left: 4px solid #2196F3; font-size: 14px; line-height: 1.6; }
table { width: 100%; border-collapse: collapse; }
th { background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%); color: white; padding: 10px; text-align: left; }
td { padding: 8px 10px; border-bottom: 1px solid #eee; font-size: 13px; }
tr:hover td { background: #f8fff8; }
@media (max-width: 768px) { .input-grid, .result-grid { grid-template-columns: 1fr; } .calc-header h2 { font-size: 22px; } .calc-container { padding: 10px; } }
/* Page-specific */
.cmd-block { background: #1e1e2e; color: #cdd6f4; padding: 10px 14px; border-radius: 6px; font-family: 'Courier New', monospace; font-size: 12px; overflow-x: auto; white-space: pre; margin: 8px 0; }
.metric-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; }
.metric-card { display: flex; flex-direction: column; padding: 15px; background: white; border-radius: 6px; border-left: 4px solid #4CAF50; box-shadow: 0 1px 3px rgba(0,0,0,0.05); }
.metric-label { font-weight: bold; color: #555; font-size: 13px; margin-bottom: 6px; text-transform: uppercase; }
.metric-value { color: #4CAF50; font-family: 'Courier New', monospace; font-size: 18px; font-weight: bold; }
.result-highlight { color: #4CAF50; font-weight: bold; font-size: 1.2em; }
</style>
<div class="calc-container">
<div class="calc-header">
<h2>این آئی سی رنگ بفر اور آئی آر کیو ایفینٹی کیلکولیٹر</h2>
<p>حساب لگانا<code style="color:rgba(255,255,255,0.9);background:rgba(0,0,0,0.2);padding:2px 6px;border-radius:3px">ethtool -G</code>رنگ بفر سائز، آر ایس ایس قطار شمار، اور سی پی یو وابستگی/اقبالینس پننگ حکمت عملی۔</p>
<div class="input-grid">
<div class="input-group">
<label>انٹرفیس کی رفتار</label>
<select id="linkSpeed">
<option value="1">1 جی بی پی ایس</option>
<option selected="" value="10">10 جی بی پی ایس</option>
<option value="25">25 جی بی پی ایس</option>
<option value="40">40 جی بی پی ایس</option>
<option value="100">100 جی بی پی ایس</option>
</select>
</div>
<div class="input-group">
<label>CPU کور دستیاب ہیں۔</label>
<input id="cpuCount" max="256" min="1" type="number" value="8"/>
</div>
<div class="input-group">
<label>ٹریفک پروفائل</label>
<select id="trafficProfile">
<option value="bulk">بلک / اسٹریمنگ (بڑے فریم)</option>
<option selected="" value="rpc">مخلوط / RPC (مختلف فریم سائز)</option>
<option value="pps">ہائی پی پی ایس (چھوٹے فریم)</option>
</select>
</div>
<div class="input-group">
<label>انٹرپٹ کولسنگ ٹارگٹ (μs)</label>
<input id="coalesceUs" max="1000" min="1" type="number" value="50"/>
</div>
<div class="input-group">
<label>انٹرفیس کا نام</label>
<input id="ifName" placeholder="eth0" type="text" value="eth0"/>
</div>
</div>
<div class="button-container">
<button class="calc-button" onclick="calcNic()">حساب لگانا</button>
</div>
</div>
<div id="nicResult" style="display:none"></div>
<div class="result-section">
<div class="section-header">رنگ بفر بمقابلہ ڈراپ ریٹ ٹریڈ آف</div>
<div class="section-content">
<table>
<tr><th>انگوٹھی کا سائز</th><th>تاخیر کا اثر</th><th>ڈراپ رسک</th><th>کیس استعمال کریں۔</th></tr>
<tr><td>256</td><td>بہت کم</td><td>ہائی (پھٹنے کے قطرے)</td><td>ریئل ٹائم، کم تاخیر کی ترجیح</td></tr>
<tr><td>512</td><td>کم</td><td>درمیانہ</td><td>تاخیر سے متعلق حساس RPC</td></tr>
<tr><td>1024</td><td>درمیانہ</td><td>کم</td><td>عمومی مقصد</td></tr>
<tr><td>2048</td><td>متوسط ​​اعلیٰ</td><td>بہت کم</td><td>بلک ٹرانسفر، 10Gbps+</td></tr>
<tr><td>4096</td><td>زیادہ (دیر کا اضافہ کرتا ہے)</td><td>کم سے کم</td><td>100Gbps، مسلسل PPS</td></tr>
</table>
</div>
</div>
</div>
<script>
function calcNic() {
    const speedGbps = parseInt(document.getElementById('linkSpeed').value);
    const cpus = parseInt(document.getElementById('cpuCount').value);
    const profile = document.getElementById('trafficProfile').value;
    const coalesceUs = parseInt(document.getElementById('coalesceUs').value);
    const iface = document.getElementById('ifName').value.trim() || 'eth0';
    const div = document.getElementById('nicResult');
    div.style.display = 'block';

    if (isNaN(cpus) || cpus < 1 || isNaN(coalesceUs) || coalesceUs < 1) {
        div.innerHTML = '<div class="result-section"><div class="section-header">Results</div><div class="section-content"><strong style="color:red">Invalid input.</strong></div></div>';
        return;
    }

    // Ring buffer sizing: ceil(link_speed_bps * coalesce_delay_s / (8 * frame_size))
    // Frame size heuristic by profile
    const frameSizes = { bulk: 9000, rpc: 1500, pps: 64 };
    const frameSize = frameSizes[profile];
    const speedBps = speedGbps * 1e9;
    const coalesceS = coalesceUs / 1e6;
    const rawRing = Math.ceil((speedBps * coalesceS) / (8 * frameSize));
    // Round up to nearest power of 2 (common NIC constraint)
    let ringSize = 1;
    while (ringSize < rawRing) ringSize *= 2;
    ringSize = Math.min(ringSize, 4096); // max typical ring size

    // RSS queues: min(cpus, speed-based cap, 64)
    const speedQueues = speedGbps <= 1 ? 4 : speedGbps <= 10 ? 8 : speedGbps <= 25 ? 16 : 32;
    const rssQueues = Math.min(cpus, speedQueues, 64);

    // CPU affinity: prefer first N CPUs, skip CPU 0 if NUMA/irqbalance concern
    const affinityCpus = rssQueues <= 4 ? `1-${rssQueues}` : `0-${rssQueues - 1}`;

    div.innerHTML = `<div class="result-section">
        <div class="section-header">Recommended Settings</div>
        <div class="section-content">
            <div class="metric-grid">
                <div class="metric-card"><div class="metric-value">${ringSize}</div><div class="metric-label">Ring buffer size (RX &amp; TX)</div></div>
                <div class="metric-card"><div class="metric-value">${rssQueues}</div><div class="metric-label">RSS queues</div></div>
                <div class="metric-card"><div class="metric-value">${coalesceUs} μs</div><div class="metric-label">Interrupt coalescing</div></div>
                <div class="metric-card"><div class="metric-value">${speedGbps} Gbps</div><div class="metric-label">Link speed</div></div>
            </div>
            <div class="info-box">
                <strong>Calculation:</strong> ceil(${speedGbps}Gbps &times; ${coalesceUs}μs / (8 &times; ${frameSize}B)) = ${rawRing} &rarr; rounded up to ${ringSize} (power of 2)
            </div>
            <div class="cmd-block"># Set ring buffer (${iface})
ethtool -G ${iface} rx ${ringSize} tx ${ringSize}

# Set RSS queue count
ethtool -L ${iface} combined ${rssQueues}

# Set interrupt coalescing
ethtool -C ${iface} rx-usecs ${coalesceUs} tx-usecs ${coalesceUs}

# Pin IRQs to CPUs ${affinityCpus} (run after ethtool -L)
# Find IRQ numbers: grep ${iface} /proc/interrupts | awk '{print $1}' | tr -d ':'
# Then: echo ${affinityCpus} > /proc/irq/&lt;N&gt;/smp_affinity_list

# Or use irqbalance with policy hint:
IRQBALANCE_ARGS="--policyscript=/etc/irqbalance/policy.sh" systemctl restart irqbalance</div>
            <button class="calc-button" style="margin-top:10px;padding:10px 24px;font-size:14px" onclick="copyBlock()">Copy Commands</button>
        </div>
    </div>`;

    window._lastCmds = `# Set ring buffer (${iface})\nethtool -G ${iface} rx ${ringSize} tx ${ringSize}\n\n# Set RSS queue count\nethtool -L ${iface} combined ${rssQueues}\n\n# Set interrupt coalescing\nethtool -C ${iface} rx-usecs ${coalesceUs} tx-usecs ${coalesceUs}`;
}

function copyBlock() {
    if (!window._lastCmds) return;
    navigator.clipboard.writeText(window._lastCmds).catch(() => {
        const ta = document.createElement('textarea');
        ta.value = window._lastCmds; document.body.appendChild(ta); ta.select(); document.execCommand('copy'); ta.remove();
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}
</script>